Have bright light therapy systems been shown to work?
Yes. Since the first controlled light therapy study in 1984, there have been more than 60 controlled studies published by researchers around the world. Experts are now confident that bright lights work for the majority of people with the Winter Blues. (Response rates of 60% to 90% have been shown). They have also shown promise as an option for those with circadian sleep difficulties, jet lag and shift work adjustment .
