Archive for May 2010

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.

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Colour tolerance and myopia

May 11, 2010

I’ve mentioned before that my partner really hates coloured light.  I haven’t tried that many colours on him, just the blue lightbox and a range of yellow and amber bulbs, but he has strongly disliked all of them.  My eye specialist has finally given a reason for why this might be the case. Colour, she says, is very important to myopes (short-sighted folks), and the more myopic you are, the more colour will matter to you.  I’m fairly fussy about colour myself, I can’t stand fluorescent light (though that’s probably a case of colour and flicker) and I’m very picky about colours when it comes to reading and tinted lenses, though I don’t know how far that is caused by having Meares-Irlen Syndrome.  I’d be curious to test my partner some time and see how much colour he can tolerate, if there are any colours he finds easier than others, or if he’s only really happy when the light is white or close to it.  I mentioned to the eye specialist that I find yellow and orange light mercifully comfortable, and she said, “Oh yes, yellow light is very soothing for the eyes.”  For reference, here is how myopia is usually categorised:

0 to -3: mild myopia
-3 to -6: moderate myopia
-6 to -10: severe myopia
over -10: extreme myopia (not usually listed as it’s so rare)

Including astigmatism, I’m about -7, so my eyesight’s worse than that of most people but I still know a fair few people who are at a similar level to me.  My partner, on the other hand, is about -19.  Before I met him, the worst myopia I’d encountered was one guy at -12 and a woman at -10.  Several opticians he’s been to have never seen myopia as bad as his, although it’s by no means the worst around.

So his reaction is unlikely to be the norm, and even my degree of fussiness about light colour seems fairly unusual.  To people who have tried different coloured light or lenses, are you myopic, and have you found difficulty in tolerating the colour?