E40 1000w n powerstar hqi e halogen metal steam bulb osrampowerstar hqi e are one sided socket ellipsoidal bulbs with average to high output only permitted for closed lampsadvantages up to 1 000 w output long lifespan good to very good colour reproduction screw socket e40 for simple bulb handling in coated designuses halls for industry and trade exhibit and trade fair halls sport and multi purpose halls