Plugs into AC.
Desktop Light Therapy Lamp 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. (2 lbs.) With less melatonin, people find they have increased energy levels and alertness. This desktop light delivers 10,000 lux of daylight spectrum light to counteract the effects of work fatigue, jet lag, and seasonal change.