ventilation cooling question

[growman420]

have a big walk in closet just bought cheap 400w hps light from htg with standard reflector without switching to a cool tube how do i keep temps down did some searching everything i see has a cool tube. i have a big squirell cage fan laying around i could wire up and could buy some circulating fans. the space is 6 x 4 at least 8 foot tall so let me know. how many plants should i put under light?

growman420 Reviewed by growman420 on 12-12-2010. ventilation cooling question have a big walk in closet just bought cheap 400w hps light from htg with standard reflector without switching to a cool tube how do i keep temps down did some searching everything i see has a cool tube. i have a big squirell cage fan laying around i could wire up and could buy some circulating fans. the space is 6 x 4 at least 8 foot tall so let me know. how many plants should i put under light? Rating: 5

[Dutch Pimp]

1. Four flowering females is a full house for one 400 watt HPS....six is about the max.

2. Will your closet door always have to be shut?

[growman420]

no it wont but will need some kinda stealth when company comes would like to seal closet and direct air out through roof?if its sealed no smell. what would i need small room air conditioner? not to worried about smell that would come out of roof.live in a remote area.just dont want friends or relatives to smell it any suggestions

[canniwhatsis]

From personal experience a single 400 won't properly do that area, maybe half of it.

DP hit the nail on the head, 4 is a full house under 400w. Unless they're tiny, less than a foot tall.


I'd say vege your girls about 15-20" tall and squeeze 4 of em under the light, they'll overlap a bit but should be ok.


As for scent, keep your doors closed and sealed, If you can go out thru the roof, find a way to bring fresh air in from the floor, or floor level. Then make sure your exhaust fan keeps the room negatively pressurized so that any gaps or air leaks into the room are pulling outside air IN thusly preventing scents from escaping via unwanted channels.

This can create a heat issue, but enough cross flow or small AC or evaporative cooler on the intake should be able to take care of it. I had 2 400's in that size space and temps were manageable with an 8" exhaust fan plumbed out a window.

[growman420]

thanks for the help thinking of starting 8 plants hopefully get 4 females veg for one month to flowering for 8 so what kinda yield would i be looking at in soil with fox farm nutes and soil?