The SL-811B produces a flicker-free, bright white light. The SL-811B duplicates natural lighting, which contributes to a general feeling of health and well being. The soothing natural light of the SL-811B minimizes glare and eyestrain while increasing contrast and clarity. The 27 watt energy efficiency light bulb is comparable to a normal 150 watt bulb and can last 5 times longer. The SL-811B’s efficient compact fluorescent lamp is controlled by an IC chip from Japan, which creates the flicker-free frequency of 25,000HzThe SL-811B features an integral Ionizer to purify your air as well as an anti-reflective lens that transmits more light at a time to reduce computer glare, lessen eyestrain and reflections.