Is 2x315W CMH too much for a 3x4 tent?

elfo777

elfo777

Well-Known Member
I just tried a 315W CMH and it outputs much less heat than my 600W HPS. Temps won't be a problem with 2x315W CMH (winter here is very cold and I had problems keeping my plants warm with a 400W HPS in the past) but is it too much light for this space? Is it doable? Just wondering if too much light on a reduced space could hurt my plants, but I am considering using 2 of these. Any input appreciated.

Edit: Tent is 100x100x200cm...
 
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Humboldtcalikidd

Humboldtcalikidd

Well-Known Member
Going to be overkill! Only one is good for your size tent. Vertical bulb or horizontal? Either way the temps will be way better than you 600. And with using less lights you could use a little heater if needed
 
Rocket Soul

Rocket Soul

Well-Known Member
2 would be a tight fit in there,
elfo777 said:
I just tried a 315W CMH and it outputs much less heat than my 600W HPS. Temps won't be a problem with 2x315W CMH (winter here is very cold and I had problems keeping my plants warm with a 400W HPS in the past) but is it too much light for this space? Is it doable? Just wondering if too much light on a reduced space could hurt my plants, but I am considering using 2 of these. Any input appreciated.

Edit: Tent is 100x100x200cm...
Click to expand...
its a bit overkill, should heat the tent about the same as a HPS 600.
From the little I've seen plants under cmh can handle more heat than under HPS so even if your temps might be high you should still be able to flower.
 
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