What wattage (HPS) for a 3.5 by 3.5 room?

one all ways like to upgrade - considering a 400 watt would a 150 be to small ?

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Okay this is how i understand it 50 watts per square foot for mh/hps your just over 12 feet if my math is right now heat will be and issue so hope you have thought about air cooled hood of some kind …
3x3 400 watt
4x4 600 watt
5x5 1000 wattts
But lets ask the big guys
@Majiktoker @latewood
Hope i got this right lol

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I have a 4ftx4ft tent and I have a 600w in it

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I have my old setup 3x3 400 watt mh/hps but went to LEDs

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No it would be 3x3=9 then 9x50=450 watts

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3.5x3.5 12.25
I just went to 600 watt more light better then less but your right
Plus more heat my way lol will need to be air cooled haha

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I’m thinkin about just addin an LED to mine, like a 600w one

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That’s 3.5ftx3.5ft=12.25sqft (grow space)

12.25sqftx50w(per sqft)=612.5 total watts

It’s easy math :roll_eyes:Lol

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Ive got two 600 equivalent 275 each true watts
And one 300 equivalent 135 true watts
In my 2x4x7 tent and my setup works great just to small

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Perfect you have 685 true watts :drooling_face::+1::v:

Hats more than what you need for that space 2x4=8
8x50=400 your in the clear I think buddy :joy:Good on lighting, now Im on to learn and master heating and ventilation systems :smirk::crossed_fingers:

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Had to take shoes off to add it up haha

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Id put 1000 watts in there if i could keep it cool but im crazy like that push it to the max

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Do you have heat issues with the 600 watter ?

Thanks ! very help-full chart

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Well I would if I didn’t have a big a$$ fan blowin into the tent
My Temps are hanging around 77-80 an that’s with only 75% power, I haven’t tried full power of the 600w. I’m waitin till I can get my fans and filter before I crank it all the way

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Yea - one all ways needs the extra room… Be nice to have two rooms one for veg and one for flower

Thanks to all the answers !! you guy’s are a great help - maybe 400 with no heat issues or 600 with a bit of extra heat - (fans needed - could use 2) but running cost would not be that great

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To be honest your going to need fans with 400watt or the 600watt but id go big because youll end up wanting more trust me im about
To by my third tent because ive out grown the others lol

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You are right in thinking about it !! Thanks !!! Now to find a bulb and reflector. Need to figure the “cfm’s” for fans. I forget the formula for cfm’s

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Exhaust
https://www.amazon.com/gp/aw/d/B00DIIPTHA/ref=mp_s_a_1_1?ie=UTF8&qid=1487811803&sr=8-1&pi=AC_SX236_SY340_FMwebp_QL65&keywords=6+fan+and+carbon+filter+combo
Intake
https://www.amazon.com/gp/aw/d/B01DXYMGOM/ref=mp_s_a_1_6?ie=UTF8&qid=1487811882&sr=8-6&pi=AC_SX236_SY340_FMwebp_QL65&keywords=4+fan+inline
My opinion one with build in speed controler