Posted tagged ‘LED’

Considering new lighting options

May 16, 2010

While my faithful GoLite is still going strong, the little white LED lightbox which I bought on eBay for £10 looks like it might be on its way out.  The timer function no longer works, and sometimes the light goes out and the cable has to be wiggled or unplugged and plugged in again in order to get the light back on.  I’ll keep going until it really is dead, but I’m starting to consider my options.

I do prefer having a spare lightbox for the sewing desk, since I hate crawling around on the floor to unplug cables every time I want to change which room I’m lightboxing in, and also because the blue of the GoLite doesn’t go well with sewing.  I’ve been interested in LED lighting for a while anyway because of the energy savings.  The snag is that while the wattage is very low, the price of the bulbs is high and apparently it’s difficult to get a comfortable shade of white.  Certainly the cool white of my current lightbox isn’t something I’d care to light my home with.

So one option is simply to buy another white LED lightbox.  The cheapest I can see is the Rio, which is £50.  It looks like a nice enough little lightbox, but this isn’t like getting a spare one for a tenner.

Option 2 is to get this all-singing all-dancing bulb.  There are various multi-coloured LED bulbs on the market, but the rest are less bright and don’t include a warm white.  This one boasts 8W of power, includes a warm white, and comes in both wide and narrow beam versions.  I could use the cool white or the blue for light therapy, the warm white for general use, and then in the evenings I would have a selection of colours from red to yellow for darkness therapy, which is something I could do with in this room.  At the moment, if I want to sew during darkness therapy time, I have a couple of lamps above head height at my desk and while the room doesn’t get that bright overall, I’m sure there’s some light creeping over the top of my orange glasses.  The total cost would approach that of buying a separate lightbox, especially if I ended up getting it a desk lamp of its own so that it could be right next to me.

Things to consider and/or ask about:

1. How good the warm white is, both in terms of colour and brightness, and whether it will mesh well with the halogen bulbs I currently use for my sewing desk.  I hear that some warm white LEDs these days are pretty decent.  It would presumably be different to those, however, as they’re creating the white light from white LEDs and this would be creating the white light from a mixture of red, blue and green.

2. I presume that even a warm white LED still has a lot of blue in it.  Would using this as a general lamp during the daytime overdo the light exposure, or would it be fine as long as I moved it a bit further away from me?  People can be outdoors for hours without messing up their sleep, after all.

3. Whether the light therapy usage time would need to be ridiculously long.  I know that one LED lightbox I researched ran on 10W, but I can’t remember if that was a white or a blue one.  At 8w, hopefully this would be close, and I could position it in the effection spot just above my eyes, although I’d need to make sure it wasn’t too close in order to avoid glare discomfort.

4. On the other hand, perhaps it wouldn’t matter if the usage time was longer since even the warm white would presumably have a reasonable effect.  This could turn out to be the lamp which you just use as your general desk lamp instead of a shorter burst of more concentrated light therapy.  If I end up simply putting it in the floor lamp which leans over my desk from the left, I’d need to make sure that the light was strong enough to more or less compensate for a 60W equivalent bulb.

5. Wide beam (88 degrees) or narrow angle beam (31 degrees)?  Does anyone know what your average R63 spotlight bulb is?  I’d be happy with an equivalent to that.  Judging from this page, the narrow angle bulb would work well.  You can also read more about the bulb in question here, where it claims that it’s equivalent to a 50W halogen.  That should be sufficient.

What my sleep’s up to these days

February 26, 2010

The yellow bulbs in the hall are continuing to work well to light the bathroom, and the salt lamp is now confirmed for staying by the bed with a pink 15W pygmy bulb in it.  I should probably mention that there’s no reason why anyone should get a salt lamp, I just find them pretty myself, and they already filter out a certain amount of blue light (though not all) through being orangey.  It’s odd, the light looks deep pink if you put it on when the room is already lit, and more orange if you put it on when the room is dark.  It’s useful for when I want to sneak out of bed and get dressed when my partner’s still asleep, as it’s not bright or blue enough to wake him up, or as soft background lighting in the late evening.  Most useful of all, the cable has ended up positioned so that the switch is down the side of the bedside cabinet, about as easy to get to from the bed as is humanly possible, which saves fumbling around in the drawer to find the red bike light or similar. By the way, if you do decide that salt lamps are nice and go looking for one, ignore all the nonsensical health claims.  They’re just pretty lamps.

For some reason my sleep’s been a little odd over the last couple of weeks.  It may be because when my partner had a week off, our routines changed slightly.  I set the clock on the dawn simulator so that it would come on an hour later, as he said he wanted a bit of a lie-in but not to end up losing the whole morning.  I was often up and lightboxing before the dawn simulation as my wake-up time seems to be well-programmed, but it seemed to work well for him.  Then we went to bed an hour or so later than usual, which for me is strange as by now you generally can’t keep me up much past midnight however you try.  I’ve also been a lot more tired than usual during the afternoons and evenings, which I am now putting down to the ME/CFIDS having a minor flare.

Now that he’s back at work, I have been wrestling with the problem of my body’s sudden ardent desire to have siestas.  I’ve snapped back into my usual wake-up time with no trouble whatsoever, but I keep getting irresistibly sleepy later in the day.  I’ve tried fighting it for a few days, using the lightbox on a double stint in the morning and/or an extra session after lunch or early afternoon, and putting the little blue LED bulb into a clip-on light (which leaves it fully visible; at 1W it’s not so bright that you can’t look at it comfortably) and putting it by the bed or laptop from 9.30 am to 3 pm.  I’ve known that LED bulb to keep me quite wired at night if used up to 4.30 pm, but it didn’t do a thing for keeping me awake in the afternoons this time.  I wondered about adding a bit of 470nm blue light to my dawn simulation in the hope that it would get the message across to my circadian clock more effectively, and tried setting it for 15 min before and after the start of the dawn simulation.  When it actually came on, it turned out to be much brighter in a dark room than I’d expected, so I immediately turned it off.  I’d still be curious to try a blue or white LED dawn simulator one day.  The only blue one I know of was put together by this guy, and the only white one that’s meant to be any good (there are some cheap ‘n’ nasty things around) is the SRS320 by Morning Sunrise (Sunrise System), which not everyone likes as an overall unit.

I have now given in and realised that my body probably just wants more sleep by now, which can happen from time to time with ME.  I slept 16-20 hours a day the first year I was ill, not that I anticipate going back to that.  But someone on an ME forum did recently tell me that she feels best when she makes herself get about 11 hours’ sleep a day, which she guesses is due to her body’s increased need to do repair work during sleep, so I think trying some extra sleep is worthwhile.  I’m still aiming for my usual bedtime but am not too worried if we end up going to bed an hour later, though I’m occasionally lying awake for a little or waking up an hour before my alarm, something that’s less common for me these days.  The siestas are going OK, they range from 1-3 hours, though I suspect today may have been more like 4.  I originally tried sleeping with the curtains open and then went for closing them so that the room is pretty dark, in the spirit of having a proper sleep.  I think I’ll go back to leaving them open, I don’t want to end up messing up my sleeping pattern by getting my body to think that mid-afternoon is bedtime.  I’ve also gone back to herbal sleep aids at bedtime, since they never do me any harm, I just stopped them because at that point they were redundant.  I may as well get all the sleep I can if my body’s clamouring for it.

So far, my sleep at night is a little more broken as described above, but I no longer have the problem of having to torture myself to stay awake earlier in the day.  My overall energy levels are relatively low at the moment, so I think I made the right call on getting more sleep.  The only snag is that when I don’t remember to turn the phones off for my siesta I get woken several times (this is bringing back how awkward it is to sleep during the day), and when I do turn them off, I forget to turn them back on again!


I’m definitely feeling better with more sleep, at least over the last few days.  I’m taking a fair bit of herbal stuff to knock myself out at night, last night it was one valerian formula, one 400mg valerian, and two 300mg passiflora/100mg chamomile capsules, but I’ve taken that sort of dose before and know that I’m absolutely fine with it, though I probably wouldn’t want to be relying on it long-term.  It’s far safer than temazepam in the short-term, though.  Last night it was mainly because I was concerned that my accidentally long siesta would mess up my treasured new sleep pattern and didn’t want to undo months of work. It took a little longer than my new norm to get to sleep (possibly – it’s really hard to tell), though far less than my old norm, and while I woke up at 7 am, I got back to sleep again.  Having a siesta has meant that I skip the stage of spending the afternoon trying to keep my eyes open, and while I’m still tired and ME-relapsy, I haven’t felt like a dead cat for a few days now.  It seems that I do indeed need this much sleep right now, even if my body has to be cajoled into getting it at the right times.

What colour should I use for darkness therapy?

February 12, 2010

By now you may be feeling rather overwhelmed by all the colours I talk about for darkness therapy.  Between my own visual comfort and what is actually available, I use products in a variety of colours.  The one thing they all have in common is that they either block/filter out blue light, or they product light which does not have any blue in it.  This means you can use yellow, orange, amber, red, or brown.  You may find that you have strong preferences concerning colour to the point where the wrong one for you makes you feel unwell, particularly if you have dyslexia, migraine, ME/CFIDS, Meares-Irlen Syndrome, epilepsy, and possibly severe myopia (short-sightedness).  Make sure you can try out a colour before committing to anything expensive.


This is the lightest colour of the set.  When used to tint glasses, it increases contrast in a way some people can find disconcerting.  It’s often available as a standard tint for sunglasses, though be sure to ask your optician whether it blocks 100% of blue light.  I have seen some websites selling yellow lenses that claimed that they would work for darkness therapy, but this study suggests that they may not.

I’ve seen two shades of yellow used as a coating for incandescent light bulbs.  Most often it’s the slightly more orangey one.  The light is a little more orange than you’d expect from looking at the bulb coating, and may be described as a marigold yellow.  I personally find it very pleasant.

Reflector bulbs can be sold with a yellow coating, but unless you are going to be using tinted glasses as well, I don’t recommend these as the coating is only translucent and I think it permits some blue light to come through.

Fluorescent bulbs can be bought with a yellow coating as well.  I don’t know what they’re like as I’ve never tried one.  They’re often sold as “bug lights”.

Yellow is rarely used for LEDs, and on the two occasions when I bought something that was sold to me as containing yellow LEDs, they turned out to be a horrible orange.  I’ve been told by lighting specialists that yellow is a tricky colour for LEDs, which is why you don’t see it often.

Candle flames are mostly yellow, although these is a small amount of white light in there as well which may or may not be enough to influence your circadian rhythm.


This is the colour I chose for my tinted glasses, mainly because it’s directly opposite blue on the colour wheel and I already knew that I got on with it from using an orange monitor filter on my laptop.  Objects viewed through orange lenses appear golden yellow, for some reason.  I find it quite a pleasant colour for lenses, it doesn’t increase contrast, and as apparently is true for many people, it makes it easier for me to read.  The colour distortion may bother you, however.

Orange-coated incandescent lightbulbs are likely to be sold as “amber”, but the coating looks pinkish-orange to me.  The light is a fair bit darker than that produced by yellow-coated incandescent bulbs, being an orange that is almost closer to pink.

Orange-coated reflector bulbs are also usually sold as “amber”.  The coating is again translucent, but I think it probably cuts out most, if not all, blue light.  It’s not the best light source, though, I wouldn’t recommend it.

Orange LEDs are commonly used for appliances, such as on electrical sockets.  Again, there seems to be difficulty in getting a pleasant colour, although the light on my kettle is not bad.

If you wish to buy a salt lamp for decorative purposes, the thick layer of salt looks pink when it is not illuminated and glows orange when you put a bulb in it.  I suspect that a small amount of white light is still getting through mine, so I put in a pink-coated 15W bulb instead and it nows glows a deep salmon colour.

Amber and brown

Amber may be used to refer to orange, or it may be a shade of brown (orange + black).  Amber and brown are common colours for sunglasses, although it has been suggested that not all sunglasses which claim to block all blue light actually do so.  I have no idea whether this is true, I suspect that it may be a marketing myth, but again, check with your optician.

The main advantage of brown is that it doesn’t distort colour in the way that orange does, and the disadvantage is that in order for it to be strong enough to block blue light, it will be quite a bit darker than the equivalent orange.  I tried a pair of amber fitover blue-blocking glasses and not only did everything appear very dark through them, but they completely hid the parts of my face which were behind them.  My orange glasses do nothing of the sort.


Red is the darkest pure colour of the set, and anything viewed by red light or through a red filter will appear monochrome.  This will be off-putting for many people.  On the other hand, there’s a school of thought that red is far more effective than orange or yellow for darkness therapy, so you may prefer to use it for that reason.  However, this site claims that “red is a very uncomfortable color to look through”, so you may prefer to restrict its use to light bulbs.

Red-coated incandescent bulbs exist, but I have not tried them.  You can also buy incandescent bulbs with red (translucent) glass called “fireglow” which will give off more light than the solid-coated bulbs, but I don’t know if the translucent coating is enough to filter out blue light.  Red reflector bulbs are probably similar to these.

Red LEDs are cheap to produce and give off a pleasant colour, so they’re commonly seen in remote controls and so forth.  If you want to use a bike light as the equivalent of a torch, it will probably be red.

Red glass is a popular option for tealight holders.  While the jury is still out on whether candlelight is acceptable for darkness therapy, I would guess that putting the candle into a red candle holder should be enough to compensate for the small amount of white light that may be present.

Bright light therapy: review of the GoLite

February 12, 2010

The GoLite is a nifty little lightbox at only 15 x 15 x 3cm, which makes it extremely portable.  It comes with extra international plugs and a padded carry case, and I have successfully used mine in Israel as well as the UK.  My version is not rechargeable, but the newer ones are, so that if you need to use it somewhere else, you wouldn’t have to scrabble around on the floor to unplug and replug cables.  The case has a clamshell design, so that when it’s closed the lid protects the LED panel, and when it’s open the lid acts as a base.  Unfortunately, the stand is not adjustable and I’ve found that it’s at the wrong angle when it’s placed on a table, so that I have to prop it up on my glasses case.  LEDs are a very directional form of light and you have to position LED lightboxes just right.  While the brightness of traditional fluorescent lightboxes is measured in lux, with 10,000 lux being ideal, the light produced by LEDs is so different that the lux measurement doesn’t apply.  I don’t think I’ve heard yet of an LED lightbox which was not bright enough, but do read reviews if you are looking at different models.

Unlike the lightboxes which came before it, the GoLite doesn’t just use LEDs, it uses blue LEDs. The manufacturers found through research that there’s one particular bandwidth of light that affects the circadian clock, at around 470nm, and luckily blue LEDs naturally peak in exactly that bandwidth.  (Despite what the manufacturers claim, all blue LEDs do this, so any lightbox with blue LEDs should do the same job.)  Traditional fluorescent lightboxes do contain some light in that bandwidth, but they don’t have very much of it.  By isolating the correct bandwidth, the idea is that you can get away with a smaller lightbox and a shorter treatment time, thus hugely increasing how effective it is.  My experience and all the reviews I’ve read of blue lightboxes appear to bear this theory out.  The manufacturers recommend a treatment time of 15-45 minutes, which for bright lightboxes is excellent, and even with stubbon sleep disorders I have always found 35-45 minutes to be sufficient.  The snag is that not everyone likes blue light, but most people are fine with it and it’s a pretty soothing light as such things go.  I have difficulty tolerating bright light and I’m absolutely fine using the light on full intensity.  The build quality appears to be good and the only problem I’ve had in five years of near-daily use is that one of the 66 LEDs now only lights up intermittently, which does not affect the efficacy or visual comfort at all.

Apart from the inability to adjust the stand and the high price, my only niggle with the GoLite that I own is that the settings are a nuisance to understand and the instruction manual wasn’t much help.  It does have various features, including a clock, treatment timer, variable light intensity, and the ability to save three different programmes, but you may need to ring up your seller or the manufacturer in order to learn how to do this.  It’s not intuitive to set, involving strange combinations of holding down several buttons at once, and you’re unlikely to remember how to do it.  After five years of use, I’ve sorted out my preferred treatment time and light intensity so that I just need to turn it on and hit “light” in order to get my treatment running, but I have no idea how to change the programme settings or even how to change the time when the clocks go back.  Thankfully I only use the one programme and don’t use it as my clock (it lives in a bedside drawer when not in use), so this doesn’t particularly matter.  I did try using Programme B for a shorter treatment time with lower light intensity for when I had a headache, but eventually I stopped bothering.  If I have a migraine, I skip the lightbox for that day, and if it’s only a mild headache, the light doesn’t seem to do me any harm.

The GoLite was my first big step in improving my sleep.  Before using it, my daily pattern was 25 hours, so that I would fall asleep an hour later every day.  I started using the GoLite when I woke up, and the pattern immediately stabilised at 24 hours.  With judicious occasional use of sleeping tablets, I could even move my bedtime and waking time back when they had crept too far forward, although I still tended towards late hours and had to accept that while the Non-24 Sleep-Wake Disorder was now firmly under control, the Delayed Sleep Phase Syndrome was only partially managed.  (Darkness therapy is what finally solved the latter.)  After some experimentation, I have settled on a 45 minute treatment time, although now that I am using darkness therapy as well I may be able to get away with less.  I found after a few years that even if I skipped my treatment for the odd day here and there, my sleep pattern remained stabilised at 24 hours, so it seems that to some degree my circadian clock has been retrained.

I bought my GoLite in 2005, back when it was the only LED lightbox on the market and pretty new at that.  The version I bought was the P1 (the link takes you to the place I bought it from, which I highly recommend).  As you can see, it’s still for sale at quite a good price now, although some people may prefer to pay more for the newer, fancier versions.

Back then, the GoLite was made by an American company called Apollo Health who made a variety of fluorescent lightboxes as well and had done quite a lot of research into light therapy.  I loved their website.  It had some of the best information about bright light therapy for various conditions that I’d ever seen, and devoted plenty of space to sleep disorders, where most lightbox manufacturers just talk about SAD.  It even had a free test you could take to find out whether you had a circadian rhythm disorder, rather like the Morningness-Eveningness Questionnaire.  When I rang the company, there was an extraordinarily knowledgable chap I could speak to about exactly how I should treat my sleep disorders using light therapy.  Apollo Health has since been taken over by Philips, which means that you have a household name, you can speak to customer services in your own country, and it’s doubtless doing great things to get the product out there, but that wonderful resource of the Apollo Health website has been lost.

The new GoLite

Philips have redesigned the GoLite so that it now looks rather different.  I haven’t tried it out yet, but I’ve spoken about it in some depth to the National Light Hire Company.  It does look snazzier, but frankly I’m not that interested in its decorative value and it’s certainly not something I’d be willing to pay more money for.

The new GoLite BLU (no, Philips, misspelling words does not make your product more attractive to me) still lacks an adjustable stand, but it does feature a built-in battery, so that it is rechargeable.  I’ve always hated having to mess around with unplugging cables whenever I wanted to move my lightbox to the other room, so this would have been a very useful feature for me, and it would have made it easier to take over to my partner’s flat in the days before he moved in.  I’ve read that it has a much wider treatment angle than the older model, though I’ve not been able to confirm this.  When I talked to the National Light Hire Company, we discussed how it compared to the Lumie Zip, another popular LED lightbox, and they said that the new GoLite has a lot more features than the Zip and is generally more modern and high-tech.  They did not know whether it was easier to use, but judging from the user manual it’s still awkward.  It features a touchscreen, which I suspect may make it even more awkward when it comes to holding down two buttons at once, although at least the display looks nice and clear, in a blue that matches the bright light panel.  Abandoning the clamshell design of the older GoLite means that you no longer  have a back that can flip over to cover the screen. From having knocked mine onto the floor countless times over the years, I think the GoLite is sturdy enough that it doesn’t matter, and they do provide a nice slimline carry case.

The GoLite continues to be known as one of the highest-quality lightboxes around, and its small size and relatively short treatment time give it a big advantage over traditional fluorescent lightboxes.  It is no longer the only LED lightbox on the market, however.  Apart from the  popular Zadro (not available in the UK), all other LED lightboxes provide white light which peaks in the blue spectrum.  Blue provides a gentler light and possibly (but not necessarily) a slightly shorter treatment time, while white is likely to be more acceptable to anyone who is picky about their light colour, for instance if they need to make colour judgements.  Whether you prefer to pay more for the additional features and reliable brand name, or save money to get a more basic LED lightbox, is up to you.  If I were starting over with light therapy now, I think I’d buy a cheaper lightbox but make sure that it was from somewhere with a good returns policy in case of faults.

Bright light therapy: review of the Lite-Pad

January 27, 2010

This is my spare lightbox, which I picked up second-hand on eBay for a tenner.  I don’t know who the manufacturer is, but this looks like more or less the same thing.  It’s a cheap and cheerful version of a fairly standard lightbox, and while it’s my secondary one so I’ve never used it on its own for more than a few days at a stretch, it seems to do the job as well as my GoLite.  The size is about the same, although the LEDs are white rather than blue.  If anything, I think it might be a little stronger than my GoLite in effect, although perhaps I just wake up more thoroughly when I’m sewing than when I’m mooching online.  I keep it on my sewing desk, so that I have white light to sew by, and to save crawling around on the floor to unplug and move my GoLite.

There is only one brightness setting, and it’s pretty bright.  I spent the first few months using it with a blue filter taped over the top, although I don’t seem to need that now.  If you’re going to go for a filter, try a lighting gel (there’s a seller on the links page) and get one that’s blue or turquoise, since that’s the colour of light that is most important for resetting the circadian clock.  With the filter, you’ll get a very cold white light.  Without it, you’ll get a white light that is colder than standard incandescent light bulbs but would probably blend in quite well if the room lighting was fluorescent.  I haven’t had any trouble with colour matching for fabrics when quilting by this lightbox.

There are three settings for the length of time.  Pressing the On button once will put the lightbox on until you unplug it (there’s no Off button!), pressing it twice will set it for fifteen minutes, and pressing it three times will set it for thirty minutes.  There’s a little red LED by the word TIMER which flashes once for the fifteen minute setting and twice for the thirty minute setting, and continues to flash at intervals so that you know which setting you’re on.  It was months before I even noticed that it was doing this, so don’t worry that you’ll notice the red light, it’s too small and dim and you have to look at it directly to notice it.

One distinct advantage this lightbox has over my GoLite is that the stand sets it at the right angle when it is perched on a desk.  LEDs have a very narrow beam angle so you have to get them into exactly the right position, and this one is just right – at least, it is for me.  I’m short and I tend to hunch over while sewing, so it’s possible that if you’re a strapping lad or lass of over 6′ and you sit bolt upright, you might need to rest the front on a book or something to tilt it a little.  Since lightboxes are meant to be most effective when positioned above the eyes, and since my sewing desk is quite cluttered enough already, I’ve managed to hook it onto the set of stacked mini chests of drawers I keep my threads and such in, by tucking the flap which forms the stand into a drawer and then allowing the lightbox to fall forwards slightly to get the light at the right angle.  It’s been there for a few weeks and not fallen out yet!

The lightbox also has a facility for producing “soothing sounds”, presumably for relaxation or tinnitus.  They are all absolutely vile.  If you want something like that, invest in a proper tinnitus relaxer.  For the price of this lightbox, I really don’t care that this function isn’t worthwhile.  It does its job with the light, it has a basic timer function, and that’s all I really need.  It doesn’t have a clock, and it doesn’t have a display to tell you how much treatment time is left, but they’re far from essential.

It does have its quirks, this little thing.  When you first plug it in, the light flashes once very briefly, which can be a little disconcerting, and I have absolutely no idea how anyone could forget to install an Off button.  If you use a cordless or mobile phone by it, it tends to make that strange little noise that is, well, made by devices which are reacting to cordless or mobile phones.  It usually settles down after a minute, though, and I can keep my phones on the desk along with the lightbox while I sew, although I may put a little distance between them.

Since I can’t even track down who the manufacturer is, I would assume that if you buy this lightbox and it goes wrong, you’re highly unlikely to get good customer support from the manufacturer.  It generally costs £40 new, so this may not bother you, and after all, the seller will be responsible up to a point under the Sale of Goods Act.

I feel that lightboxes are generally hugely overpriced and that it is high time that cheaper models were widely available.  It’s not particularly high quality, and it certainly doesn’t have fancy features of the more expensive models, but for this price I think it does the job very nicely indeed.  That was £10 very well spent.

Bright light therapy: review of the Lumie Desk Lamp

January 27, 2010

The Lumie Desklamp provides 10,000 lux of light at 20 cm.  20cm is closer than is recommended for visual comfort, so at a more sensible distance this will be a lower-powered lightbox  This light uses 55W of power, so don’t think that just because it’s a species of low-energy bulb it’ll save you power compared to your ordinary desk lamp, but you do get a very bright light for that wattage.  The height is 45cm, the head measures 45 x 18cm, and the base 27 x 21cm.  At 2.5kg, this is a hefty piece of kit, though at least that means it won’t fall over.

This is the first bright lightbox I tried, five years ago when the variety of lightboxes available was not as great.  I found Lumie (then Outside In) while reading up on light therapy and was impressed by the amount of research on their website.  The free trial, where you pay upfront but receive a refund if you return it within 30 days (6 weeks for ME sufferers), was a definite bonus.  I spoke to Lumie and we decided that this would be best for my needs, mainly because it is equipped with a dimmer. I expressed concern that the light would give me migraine, as it is a fluorescent bulb.  Lumie said that they’d eliminated the flicker that is one of the reasons why fluorescent light is uncomfortable for many people.  I don’t know whether they failed to do so entirely or whether it’s just that fluorescent light is uncomfortable because of the colour of the light as well as the flicker, but it gave me dreadful migraines, so I had to return it.  Lumie advised me to try building up gradually from a short period on a dim setting, but it made no difference.  Having spoken to them again just now, they still seem to be under the impression that this is a lovely comfortable light that no one could possibly object to, which I felt was a bit too heavy on the sales approach rather than the medical realities, as intolerance of fluorescent light is typical of ME sufferers, migraineurs, many dyslexics, epileptics, and occurs with lots of other people.   Apart from that, I have always found their customer service to be extremely helpful and highly knowledgeable.  Everything went smoothly and I received a full refund.  I would not recommend this lightbox for anyone who is sensitive to fluorescent light, but if this does not apply to you, read on.

The Lumie Desklamp has been designed so that it can be used as a lamp as well as a therapeutic lightbox, which is unusual.  One benefit of this is that it is more discreet: if you’re using it in the office, it’s far less likely to cause your colleagues to ask what it is and then embark on a discussion of your health problems.  The dimmer function (the knob on the base) and the adjustable neck means that it is easier to adjust for comfort while you are using it, and that you can then turn it down and angle it away from you to use as an ordinary desk lamp.  It looks simple and well-made.

Fluorescent lightboxes range from 2,500 lux to 10,000 lux.  10,000 lux is more common these days, as it requires a shorter treatment time (which will still be longer than the treatment time required by an LED lightbox).  This lightbox uses 10,000 lux and at that setting Lumie recommend a treatment time of 90 min for SAD.  (How long is needed for sleep disorders is an entirely individual matter, but I know that I need longer than the recommended treatment time with my LED lightbox.  Use the SAD recommendations as a way of comparing different lightboxes.) An alternative is to use it at a medium setting for longer than the recommended time to get the same overall effect, which again will be a bonus for some people who are more sensitive to bright light.  This is a lightbox which requires you to be sitting by it for quite some time, so it’s one to use while in front of a computer in the morning rather than while gulping down breakfast before dashing out.

Apart from this, it’s a fairly basic lightbox, without the bells and whistles of the GoLite, for instance.  It doesn’t have timer function or a display which could show, for instance, a clock, the time left for light therapy, or the brightness.  About the only one of those I’d consider to be essential is the timer, but you can easily just use a timer on your computer or mobile phone, or buy a kitchen timer.  That said, it would be handy if the dimmer knob was a dial with numbers instead, as it is useful to know the exact effects the different levels of brightness will have on you, especially when you’re at the beginning stage of working out how long to use it for and what brightness setting you prefer.

One of the definite advantages of this model is that the light is positioned exactly where it needs to be, above the eyes.  If you look at this picture, the light is positioned pretty ideally.  I also find it is easier to have the light off the tabletop and up out of the way of desktop clutter, although with such a big lamp base there is less of an advantage here.

While I’m not madly keen on fluorescent light in general, as it really isn’t the best thing to be exposing your eyes to and will cause medical problems in a number of people, it does have one advantage over LEDs in that it covers a broad area, whereas LEDs are highly directional.  This plus the completely adjustable neck means that you really can have the light exactly where you want it.

It’s not the quickest lightbox to use, but if you are in the market for a fluorescent lightbox then I think this one has many advantages worth considering, and it is reasonably priced.

What colour light should a lightbox produce? White, blue, full-spectrum?

January 26, 2010

There’s rather a kerfuffle going on amongst lightbox manufacturers as to what is the correct colour for bright light therapy.  Older models of lightboxes all used white fluorescent light, and I think that what is going on is mainly about the longer-established manufacturers trying to hang onto the market, while the new ones are trying to persuade customers that their exciting new product is superior.  So on one side you have old-fashioned white lightbox manufacturers baying that blue light will ruin your eyes, and on the other you have blue lightbox manufacturers claiming that blue light is all that matters.

From all the research I’ve read, it does seem that blue light is the most effective bandwidth.  Blue light is, of course, contained in white light, and even the brightest lightbox will not be as bright as outdoor sunlight.  If thirty minutes in front of a little lightbox was enough to wreck everyone’s vision, we’d all be blind from the sun by now, even with modern indoor living. has written an excellent article on the purported dangers of blue light, concluding that unless you are at high risk of macular degeneration, you don’t need to worry, and to be sensible and not stare directly at your lightbox.

This spectrograph was produced by Apollo Health, the former manufacturers of the first blue lightbox, the GoLite, so it’s not from an unbiased source.  However, all the research I’ve read agrees that 470nm or thereabouts is the most effective bandwidth for affecting the circadian clock, and I’ve seen several spectrographs of fluorescent light (which is the  “standard full-spectrum” in this graph) that look the same.  Fluorescent light is spiky, which is apparently why it’s so harsh on the eyes, and even the full-spectrum versions don’t peak at 470nm.  Presumably this is why fluorescent lightboxes are a great deal larger than LED lightboxes and require longer treatment times.

Something interesting about LEDs is that the blue ones all seem to peak around 470nm naturally (warning: the page has lots of images and takes a long time to load).  This is why I suspect that using a standard blue LED bulb may not be as strong as a fancy lightbox, but it’s the right type of light and if used for longer, may have the same effect.  Typical white LEDs contain a broader bandwidth of light overall, but they turn out to peak around 470nm too (also a long page).  Here’s a typical example of a white LED bulb.

Some lightbox manufacturers claim that their LEDs are “blue-enriched white”, but frankly I think that they’re perfectly ordinary LEDs, the manufacturers are just cashing in on the fact that they happen to peak in the blue bandwidth.  (The advertising shenanigans of light therapy manufacturers can drive you demented at times.)

This means that white LEDs produce a cold light that most people don’t particularly like for domestic lighting, but it makes them ideal for bright lightboxes.  I’ve concluded that while blue light is the most effective, white LEDs are so close behind that you may as well choose your lightbox based on your personal preferences.  Some people find the blue light to be softer and less disruptive, other people find that they need white light so that they can look at colours properly (I once made the mistake of trying to do some embroidery with my GoLite on, and had to unpick it all afterwards as I’d picked up the wrong coloured threads), and a few people, such as my partner, just can’t get on with coloured light.  Choose according to your visual comfort and the other factors involved in choosing a lightbox, such as price, overall product quality and the various features that a lightbox can have.

If you prefer fluorescent lightboxes, there is the question of whether to go for normal or full-spectrum.  As far as I can tell, it doesn’t make any difference therapeutically, so go for whichever light you find to be most comfortable for your eyes, if you can even tell the difference.


Images courtesy of the LED Museum.