E27 halogen metal steam bulb powerstar hqi e with quartz technology osrampowerstar hqi e are one sided ellipsoidal bulbs permitted for open and closed lamps and uv reducedadvantages screw socket e27 for simple bulb handling different light coloursadvantages of the uv filter technology decreased material stress within the lamp the uv filter from the bulb corresponds with the requirements from iec 61167uses shopping passages conference rooms classrooms libraries halls for industry and