From: gts (gts@optexinc.com)
Date: Tue Sep 03 2002 - 16:41:14 MDT
Robert,
> I think the receptor (at least in the eye) that serves as the signal
> initiator for this pathway has only been isolated within the last year
> [no ref close at hand]. I don't think we know its spectral response
> characteristics yet (my guess would be it prefers yellow).
I believe relief from SAD may come from modest exposure to invisible
ultra-violet light (rather than yellow light). Unlike the sun, most
commercial lamps do not emit ultra-violet.
You've probably heard that UV rays can be dangerous in excess. This is
true but the dangers have probably been over-stated (thanks mainly to
the marketing efforts of sunglass and sunscreen manufacturers). The
reality is that humans evolved over millions of years on a healthy diet
of UV far in excess of that which modern humans are exposed. We are
genetically adapted to a life under the sun. Among other things UV from
sun-light is the catalyst for the production of vitamin D. It makes
sense that we should have receptors in the retina or elsewhere to allow
for feedback to the central nervous system about the level of one's
exposure to UV. In other words it makes perfect sense that modern
desk-bound executives might feel less than well when they get less UV
than their genes expect.
By all means take a serious look at full spectrum lighting. I really
hope it helps you.
-gts
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