Been looking for one of these at an affordable price for a while. This one is medically certified and has the recommended 10,000 lux output required to have the proper effect. Gets good reviews on Amazon.
Light levels determine the sleep / wake cycles of both animals and humans. The desire to sleep is brought on by the secretion of Melatonin and the bright natural light. The light from a SAD lamp significantly reduces Melatonin, greatly improving our energy levels. Typical symptoms of SAD are depression, lethargy, anxiety, craving, social problems, sleep problems and loss of libido. These symptoms can be commonly resolved through the use of lightboxes