Flicker-free, bright white light duplicates natural lighting, which contributes to an overall sense of health and well being. Soothing natural light minimizes glare and eyestrain and increases contrast and clarity. 27 watt energy efficiency light bulb is equivalent to an ordinary 150 watts bulb and lasts 5 times longer. Efficient compact fluorescent lamp is controlled by an IC chip originated from Japan, which produces a flicker-free frequency of 25,000Hz. Features built-in Ionizer to purify the air as well as an Anti-reflective lens that transmits more light to decrease computer glare, reduce eyestrain and disturbing reflection. Input voltage: 120V / 60Hz Power consumption: 27W. Dimension(W x L x H): 6.5 x 8.5 x 23 in. Net weight: 3.5 lbs. Warranty: One-year parts and labor warranty. Customer must pay all repair and freight charges after warranty period. Warranty applies to residents of the United States only.