E40 powerstar hqi ep halogen metal steam bulb with quartz technology osrampowerstar hqi e are one sided ellipsoidal bulbs permitted for open and closed lamps and uv reducedadvantages of the osram 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 trade exhibit and trade fair halls train and subway stations pedes