I have a xtrasun 430 Watt HPS ballast. The grow store included a Solar NRG. (400 Watt HPS to MH conversion) After 3 months of using the bulb we moved. The bulb worked for 2 days at the new house, and then went to just a blue arc. The move may have negatively affected it, but it could have been the ballast. I've heard they are nearly identical components, but those slight differences affect it.
iGrow27 Reviewed by iGrow27 on . Safe to use 400w Bulb w/ 430W Ballast? Don't want any fires, and I have a 430w HPS ballast and a 400w metal halide conversion bulb. Is this unsafe? If so I will just use the 430w sodium bulb for now. Thanks Rating: 5