So im going to build this cabinet as a flowering room. I'm on the budget though. All I have now is 250w MH (so can I buy a HPS conversion to use with this MH ballast and is it enough power for this cabinet?). Also got an 8" blow fan. I dont know the exact CFM (anyone can tell?). Im gonna use it for exhaust with a DIY silencer box and speed controller (will that work to silence the fan?). Then, buy a 6" duct fan as an intake with air filter to stop odor. Im still considering about my 250w light position. If I put it on top of this cabinet(the unit gonna be outside of the cabinet, so heat is not a ig problem), the distance from light source to top of the plants estimated 22". This is my first grow ever, so if anyone has some experiences please share with me. Thanks