E27 50w 70w vialox nav t sodium steam high pressure bulb osramproduct advantages dimmable on conventional ballast and electronic ballast optimal energy efficiency when operating on evg powertronic pto 3dim up to 25 higher lifespan than standard bulbs higher reliability than standard bulbs up to 20 more light yield than standard bulbs larger pole dimensions possible than with standard bulbs better light current than standard bulbs four year replacement cycleusage areas industrial sys