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How many watts for 4 plants?


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#1
Mashiro

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As the title states... how many watts of light would you need for 4 plants in a tent similar to mine?

Tent in siggy.

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#2
will3117

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600 hps its what i use for 4 plants, scratch that I use a 2x4x5 tent and scrog 4 plants, 2x2 im thinking 400 would work, also check amazon they have a sweet 600 dual hps and mh with a dimmible ballast so you can adjust to your best light range..

Edited by will3117, 11 April 2012 - 02:16 AM.


#3
Tihspeed

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#4
Mashiro

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It's a 2' x 2' x 4' tent. For ventilation right now I only have a 6" duct fan. I'm saving to upgrade that right away.

#5
will3117

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It's a 2' x 2' x 4' tent. For ventilation right now I only have a 6" duct fan. I'm saving to upgrade that right away.


why would you need to upgrade? im running a 6" duct fan too, its 500 cfm does good on the temp control venting for a 600 hps, with passive intakes and 3 9" fans for air flow...I was thinking two 6" duct fans and filters, but seems like overkill, so i stored the extra set for back ups.
'

#6
Mashiro

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why would you need to upgrade? im running a 6" duct fan too, its 500 cfm does good on the temp control venting for a 600 hps, with passive intakes and 3 9" fans for air flow...I was thinking two 6" duct fans and filters, but seems like overkill, so i stored the extra set for back ups.
'


What size is your grow area?

#7
will3117

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it is 2x4x5 tall

#8
Mashiro

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I dunno, I've just always had the impression that duct fans won't do the job. Also, can you attach a carbon filter to a duct fan?

#9
Tihspeed

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#10
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#11
Mashiro

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im just going to post this just so i make sure we have it right

Length x Width x height = 2 x 2 x 4, right?

with a tent that small all you need is 400 watts... that's 100 watts a square foot(think more of footprint rather than cubic feet) that being said you can never have too much light(unless its too close) but you can have too much heat....

maybe consider getting a 600 digital ballast that you can turn down to 400, this way if you can handle the heat in the tent you can leave it on 600, and if not dial it down to 400

problem solved?


Thanks, man! I did not know you needed 100 watts a square foot. Also, if I did upgrade to a better exhaust fan to control temps, what sort of CFM range am I aiming for in a new fan?

#12
will3117

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I dunno, I've just always had the impression that duct fans won't do the job. Also, can you attach a carbon filter to a duct fan?


im running one 6 inch duct fan with carbon filter its rated at 500cfm, it sucks air across the 600 watt hps, the 3 9 inch fans are purely for air circulation ive found the more air you move the cooler it stays and the happier your plants are, im growing indicas (Crimea Blue) using scrog to keep the height down.

#13
Kronikkk

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600 would be perfect for some nice large, high-yielding ones. A 400 would suffice though if u dont need like an lb in one run.

#14
Mashiro

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im running one 6 inch duct fan with carbon filter its rated at 500cfm, it sucks air across the 600 watt hps, the 3 9 inch fans are purely for air circulation ive found the more air you move the cooler it stays and the happier your plants are, im growing indicas (Crimea Blue) using scrog to keep the height down.


Mine is rated at 250 CFM.

#15
Tihspeed

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#16
obsstar

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Also, can you attach a carbon filter to a duct fan?


carbon filter (if inside the tent) > ducting > duct fan...duct fan > ducting > carbon filter (if outside the tent)...but I don't know if there would be enough pull/push, never tried it personally.

#17
will3117

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this link is for the in line filter combo i run, i bought two but only use one, my space is 50 percent larger than yours...Amazon.com: New Hydropronic 6" Inline Fan With Carbon Filter Combo Odor Control Air Quiet: BestChoiceproducts

#18
will3117

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this is the light I use its dimmible and uses both hps and mh, if you can only get one light this is the type you want...Amazon.com: 600w Super HPS MH Grow Light System Digital Dimmable Hydroponic 600 watt hps mh grow light set kit. 600w ballast, Super High Pressure Sodium bulb, Metal Halide bulb, 19" Wing Reflector and pair of yoyo. Comparable to Hydrofarm and Sun Lig

#19
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My tent is just a little bigger than yours (2x3) and I'm using a 400w to veg, 600w to flower. I've got 4 plants in there right now, and it seems like it'll be pretty crammed when they're bigger (might have to move one or two to my big tent). I think my fan is 170cfm, and it cools my lights and ventilates just fine. Not sure how the 600w is gonna do in there...guess we'll see.


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