This desktop light delivers 10,000 lux of daylight spectrum light to counteract the effects of work fatigue, jet lag, and seasonal change. Just 30 minutes of exposure to the light from this slim box can block the release of melatonin, a sleep hormone. With less melatonin, people find they have increased energy levels and alertness. The light’s small 5 1/4" x 3" footprint allows it to fit easily on work surfaces, unlike previous generations that take up significant desktop space. The light uses a special 36-watt bulb rated for 10,000 hours, electronic ballast to ensure buzz-free operation, and flicker-elimination technology that prevents electromagnetic fields. Plugs into AC. 13 1/2" H x 6 1/4" W x 2" D. (2 lbs.)