Available in three sizes 2 feet by 4 feet, 2 feet square, and 1 foot by 4 feet the HP90 line of high-performance recessed luminaires fits both standard and slot grid ceilings. A softly balanced light is created by the even illumination of each fixture's curved body and matching-profile prismatic acrylic lens. The luminaires take 28W fluorescent lamps. Ballasts are accessible through the fixtures' lamp compartments, and available options include step dimming, occupancy sensors, and daylight sensors.