Bring colors and texts to life with PureOptics LED lighting technology: experience improved clarity, higher contrast, and true, brilliant colors. Ideal for mid-size to large work spaces, the 5 watt, 267 lumen output and simulation of refreshing natural daylight reduces eye fatigue and acts as a mood booster. Innovative in design, the lamp head is powered by a recharageable lithium ion battery and can be easily removed for portable lighting. During power interruptions and outages, the lamp head automatically illuminates. With a single touch, adjust the refreshing, white flicker-free and glare-free light to one of four dimmable lighting levels. Once selected, the memory function saves the last brightness setting&mdash even after it is powered off. The durable LEDs last 15 years and use 85% less energy than incandescent bulbs. For added versatility, an integrated USB power port in the base allows for convenient device charging. Base Color: Black Plug Type: 2 Prong Height: 19" Width: 7". Unit of Measure : Each