GavitaMaster GP T EL 600 Watt 400 Volt is a HPS Single Ended mogul bulb. This bulb has the highest micromole output in the industry!
Instead of being vacuumed The Master GreenPower electronic lamp is gas filled, which allows for a smaller arc tube, improving optical control.
This specialized bulb WORKS ONLY in 400-VOLT COMMERCIAL GRADE BALLASTS
See the Gavita line; state of the art electronic ballasts, high efficiency reflectors & complete fixtures