At 40 watts and high lumen output, USHIO Ultra 5000 T10 fluorescent lamps can increase light output up to 15 percent over T12 lamps, while producing a white, more natural daylight color. When used with electronic ballasts, an additional 10-15 percent in energy savings may result. The triphosphor coating allow for exceptional color rendering at 90CRI making these lamps ideal for paint stores, retails shops, clothing boutiques, hair salons and graphic arts studios or other environment where color rendering is critical. The Ultra 5000 T10s are manufactured with a cathode guard which prevents end darkening to insure maximum light output throughout the life of the lamp.