I have a scrog in a 2x1.5x9 foot room and vegging right now. I'm about to buy an hps, but what should I go with? 250 watt or a 400? I know the 250 would do good in a small space, but I want to get the biggest yield. So maybe I could go with a 400 watt hps. I just want to know if the 400 would be over kill. Cooling isn't an issue. I have different cfm fans for any light. If I bought the 250 i'd use a 200 cfm inline fan, and if I go with a 400 then i'll use a 6" 435 cfm inline fan. I also have an inline reflector to use with the fans.