E40 powerstar hqi t metal steam bulb for closed lamps osramthe proven powerstar hqi bulbs with screw socket e40 is available in different light colours in the output levels 1 000 and 2 000 w permitted only for closed lampsadvantages up to 2 000 w output different light colours screw socket e40 for simple bulb handlinguses halls for industry and trade sport and multi purpose halls industrial systems airfields wharf and harbour facilities classification yards container floating termi