My little 150w HPS cant be switched out the way it is,,it can only use a 150hps bulb,,believe it or not I ran across a guy at a yardsale about 2 weeks ago that had like 4 250w/400w sun system 2 i think they were...I figured he would sell them cheap because condition they were in but he really surprised me when he told me he wanted $100 a piece for them, I was thinking to myself...Hell I can go buy brand new for like $150-$200 with darn bulb included probably LOL