E40 250w400w nsi powerstar hqi t halogen metal steam bulb osramhalogen metal steam bulbs powerstar hqi with quartz technology powerstar hqi t with average output and screw socket e40 only permitted for closed lampsadvantages up to 400 w output long lifespan screw socket e40 for simple bulb handlingadvantages 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 halls for industry a