Teresa (Kenedy, Texas) on 09/01/2008

Using blue light for "light therapy"

As you probably know, there's a version of depression called "Seasonal Affective Disorder" (SAD), or "winter depression". This kind of depression -- which is very common in people with Bipolar II -- can be treated with light. Plain old light will do, but in some parts of the country in December plain old light is hard to come by So several decades ago researchers studied whether sitting in front of a bank of lights for 30-60 minutes might help reverse the seasonal sag in mood, and found that indeed some people seemed to respond very well. In the most recent study of "light therapy", sitting in front of a box of light every morning during a Canadian winter was as effective as fluoxetine (Prozac).

But the light needed for this, from a suitcase-sized "light box", was hard to get: insurance companies almost never pay for these boxes, which are expensive, usually around $250-300. They are not very portable.

However, now a very small light box is available for around $140 (e.g. from Costco last winter) that's much more portable, so you can use it where you happen to be in the morning. The key was finding just the right wavelength of light for this purpose, which allowed the box to be much smaller. I hope you already know, from the story above, what wavelength that is: blue light -- the striped peak in the graph above, which comes from the manufacturer's website (I have no financial connection to that manufacturer, and get no gain from telling you this story. I'm telling it here because I think it's a great story, and because understanding it may help people get an effective treatment they might not have considered otherwise).

This little light box has been tested for effectiveness just as the older bigger light boxes have, and shown to be superiorGlickman to the "control" condition -- a dim red light, admittedly not the greatest control condition, but this research has been hard to do, coming up with a plausible "placebo" treatment. A better test would be a comparison of the blue light versus white light, which might be more plausible as a placebo, as the older light boxes emit a white light. That study has been done, and the blue light was superior (not yet published, the manufacturer tells me, as of June 2006). The best test would be a head-to-head study of the little blue one versus one of the older big ones, which we know from years of research are truly better than a placebo. But the blue-light manufacturers have little incentive to do that study (what if theirs was not as good?), so we're not likely to see that research unless one of the manufacturers of the old light box pays for it!

link http://www.psycheducation.org/depression/BlueLight.htm

Replied By Tracy Reinert (CA) on 08/23/2023

I have had a blue umbrella over my sunbathing bed, & presently have a white one. I barely use it now, tho' it is prettier. The big blue umbrella always made me feel good, like a rich, blue sky above me. These are pricey, & fade rather quickly in a year or so. Yet, I think it is effective done this way!