In what context? For SAD or for skin probs? Although I haven't had specific light therapy for my psoriasis getting out in the sun makes it sooooo much better. But I do burn easilly so catch 22! lol
I prefer infrared treatments. These can vary from use of lasers to solariums to rugs.
My physio will pinpoint an area with the laser. I will tack up/untack under the solarium, but generally I use the back on track rugs to keep the muscles stimulated and aid muscle damage etc.
I have used the rugs on horses with supraspinous damage, sore muscles, jarring, muscles which have spasmed and as normal warm up/cool down for horsesin normal work.