Do the lights cause tanning?
They shouldnt. Most light therapy systems shield out the ultraviolet rays that causes tanning, or substantially reduce them, in order to avoid harmful effects of UV. Occasionally a person with sensitive skin shows reddening under full-spectrum lights, in which case complete UV blocking, with filters, alternate bulbs, or a sun screen lotion is needed. This should not influence effectiveness, however; the action of light therapy is through the eyes, not the skin, and in adults UV does not reach the retina (unfiltered artificial lens implants are an exception).
