Most people with winter-onset SAD can benefit from light therapy, but in light therapy, the devil is in the details. A very basic, bottom line description of light therapy is that it consists of light entering the patient's retina from a prescribed distance for a prescribed amount of time. But distance and angle of the light, time of day the therapy is performed and amount of light need to be taken into account, tested and possibly tweaked to get the best result for each patient.
Intensity...
