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LED lumens per cubic feet?

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- Thu, 19 Jul 2018 20:52:54 EST L9qbicZu No.146166
File: 1532047974549.jpg -(239887B / 234.26KB, 961x1269) Thumbnail displayed, click image for full size. LED lumens per cubic feet?
I have a tent that is 41 cubic feet. I have 29k lumens from my LED lights. Will this be optimal for that tent space? I don't care about heat, just whether that lumens per cubic foot is good with LEDs. Does anybody have an idea or does it entirely depend on the LED spectrum?
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Alice Foshhood - Thu, 19 Jul 2018 21:34:19 EST B0kZyQRI No.146167 Reply
anything more than 1000w/square meter is overkill
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Phineas Hemblefuck - Mon, 23 Jul 2018 00:33:53 EST NCtp+u6l No.146176 Reply
>>146166
>Cubic feet
Totally useless measurement
What the square footage?
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Oliver Sickleterk - Mon, 23 Jul 2018 17:39:38 EST +feR4wOL No.146178 Reply
Oh you americans

>>146167
Actually it's even half of that. 400W/sqm is considered optimal.
You can go higher, and get something out of it but you'd have to utilize some vertical growing techniques like V-sog, scrog/lst.



LED spectrum wise, get warm white 2700-3500k low cri high efficient LEDs should be at 160-200 lumen/watt (yes 200, check out samsung linear led modules)
These are better than any possible red/blue light at this point. Don't buy the purple crap, nobody in the greenhouse industry uses them.
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Hannah Dartgold - Thu, 02 Aug 2018 01:57:39 EST B0kZyQRI No.146219 Reply
>>146178
The sun puts down about 1100watts per square meter. Does it for free too. If you could control the heat and pay the power bill at that density of light indoors the plants could almost certainly handle it. Maybe if you lived in Barrow, Alaska, kept your tent outdoors during midwinter and powered it with stolen crude oil.
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Nell Buvinghood - Sat, 11 Aug 2018 16:09:43 EST +feR4wOL No.146236 Reply
>>146219
Most of the suns energy isn't used by the plants. And that 1kw /sqm figure is true for high noon near the equator with a clear sky, so...
Anyway that 400W / sqm figure is a general ballpark figure for indoor and it has some caveats.
That was true for HPS light (if you use highly efficient leds it's actually a little bit lower even) and it is meant to get the most out of a particular light meaning:
If you give it more space the quality of the product will suffer, if you give it less space the yield won't be as high.
Of course if you want to get the most out of a particular space you go with more light intensity.
1000W / sqm is still too much (not to say it won't work you are just wasting power and making it hard on yourself.)
600W / sqm if you want to get the most out of an area. Any more again you will be wasting power and it will be harder to keep cool.

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