How many plants could I put under this light...

Bro u wont need an a/c with a 400w....My light wasnt even noticeable on my bill...Its like running a flat screen t.v .....I have a 600w and only a box fan outside of my closet and have done this for 2 grows with no dissapointments(except a 1/2oz lost to mold)not bad considering i got over 1/2lb with 6 haze autos at that....And besides that the summer is almost over...Just make sure u have a couple of fans and constint air flow exp..durning late flowering as thats when u get hit with mold...I did..GL bro u'll be fine...People r always stressing it has to be 78 degrees and nothing over mid 80's well if thats the case it wouldnt ever grow outside..lol

I would never spend $400.00 on some LEDS. You could get 2x 600 watts HPS bulbs and get some crazy crop with 9 plants per bulb, totaling 18 plants at a minimum of 45 grams per plant. This is going to equal to 810 grams or 1.78 lbs