Two good products to use for light therapy are the Carex Daylight Classic and the Sphere Gadget Technologies Euphoria, according to PsychEducation.org. The standard measure of light, or lux output, of both products is 10,000, similar to sunlight on a clear day, which is important to obtain the benefits of light therapy. Another important factor is shining the light from above eye level, which is a built-in feature of the Carex and possible with careful placement of the Euphoria.
Three elements that make light therapy an effective treatment for seasonal affective disorder are the duration of treatment sessions, the time of day the therapy session takes place and the intensity of light, which should be between 2,500 and 10,000 lux, advises Mayo Clinic. Light therapy may begin with 15-minute sessions and increase to 30 minutes or as long as two hours, depending on the intensity of the lamp.
A lamp producing 2,500 lux may require two-hour sessions, while a lamp producing 10,000 lux usually requires approximately 30 minutes to be effective, notes Mayo Clinic. In addition to the length of therapy sessions, the lux intensity affects how far a person sits from the light source during therapy. Treatment sessions should take place close to waking time, although some people achieve more effective results with a different schedule.