i would say no, the power runing through tha ballast would be for a 400- your 250 bulb would blow
merlockian Reviewed by merlockian on . Light Bulb Question Hi, I have a switchable 400w hps/mh system.. can i put a lesser bulb than 400w, like a 250w bulb? Anyhelp is appreciated. :) LadyIgnite:D Rating: 5