I would of went 600 but heat is a issue for me so I usd glass shelves from fridge to make a kinda cooltube setup above plant..Mullowman said:Yeah 24 on 400w hps..
my room measures 1m x 500 x1200 total grow space..
ie bulb is boxed in with glass shelves and ducted separately.
and the light in such a space pretty much on par with the sun I think like 80000 lux @ plant height ..I believe the closer u can get to sun strength the better internodal spacing