ok Sherri you just opened up a big can of worms. lol!! ok first off are you looking to get away from MH? also according to Mr Valentine I think going to 150w or 175w with a certain reflector has given him better par results than his 400w(hope he chimes in to correct me), which would equal a lil savings in power consumption. then there is the new LED fixtures which are getting better almost every month.