It's a good bulb. It's not to be used in digital ballasts, HPS magnetic ballasts only. It is rated for open fixtures; no cool tubes, no glass inclosed light fixtures. Comes in 250 watt too. Is sold in vertical and horizontal versions.
Dutch Pimp Reviewed by Dutch Pimp on . hps-retro white ed18 I just bought this ceramic metal halide that has the best spectrum i have seen. the spectrum goes straight across the middle no little spikes here and there just a fat wad of color. the local hydro store guy said its the best for vegetation and flowering. You dont have to change to a hps for flowering also it works in a hps ballast. i got a 400watt. its called hps-retro white ed18 made by philips. Rating: 5