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how many lumens do I need?


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#1
the bear smokey

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I have 1 plant. Its has starting getting flowers already. I have a small grow box. I was wanting to know how many lumens should I have on my plant. I am using cfls just because I have only 1 plant

Edited by the bear smokey, 24 October 2011 - 11:22 PM.

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#2
vostok

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100 watts per square foot, is the average,cfls good for veg, but try something better, even the sun, budding NEEDS light.

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http://forum.grassci...vostok/library/

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#3
toastybiz

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Some will tell you minimum 3,000 lumens per sq ft, but I put the minimum at 5,000. For comparison, the sun is about 10,000 lumens per sq ft.

#4
Lay Low

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I agree with toasty. Minimum that I would recommend would be 5,000-6,000. Ideal would be 10,000-12,000.

#5
smoketoker

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The sun gives 10,000 lumens of a varied spectrum. Having 10-12,000 lumens per square foot (of MH/HPS) is a complete waste because a plant cannot use that much.

5-6,000 is ideal. If you're adding co2 7-8,000.

Here's loads of info on lighting: The Green Pages - Lighting
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#6
Lay Low

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The sun gives 10,000 lumens of a varied spectrum. Having 10-12,000 lumens per square foot (of MH/HPS) is a complete waste because a plant cannot use that much.

5-6,000 is ideal. If you're adding co2 7-8,000.

Here's loads of info on lighting: The Green Pages - Lighting


It's not a waste. 10,000-12,000 of calculated indoor lighting would only equal about 6,000-7,000 ish actual lumens at the canopy level due to inefficiencies in reflectors. It's true that 10,000 actual lumens at the canopy level would be too much, I agree with that.

#7
Lay Low

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Also the reason why plants can handle the 10,000 lumens given off by the sun has nothing to do with spectrum. It's because 10,000 lumens is only received for a small portion of the day when the sun is directly overhead.

#8
HelpDesk

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I think i'll just flood my 4 plants with a 95000 lumen hps light... They are fucking loving it.

#9
Lay Low

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I think i'll just flood my 4 plants with a 95000 lumen hps light... They are fucking loving it.


I have 150,000 lumens on 3 plants.. :smoke:

#10
HelpDesk

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^Son of a bitch... I'me expecting a pound. That was my last grow with the same setup as this... but now i have better nutes.

#11
madero420

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i'm new here so bare with me on this... I have a 4 week old grape ape in the veg stage running on 9200kelvin and 4478lumen cfl's ..tips advice ??? i will add 2 more cfls 1750 lumens and bring me to 8350 lumens when i flower good need something or...??

#12
toastybiz

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Remember that lumens is a measurement for comparing one bulb to another, not a way to know how much light your plant is getting. Take a light rated at 100,000 lumens, raise it 2 feet, and the lumens remains the same but the amount of light the plant is getting is changed dramatically...

#13
Greenbudz

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#14
c0rup7

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I'm pushing 86,000 lumens out of my 600W HPS but that's a 6 plant medical grow so I guess it all depends on your goals and how many plants you want to grow. I would recommend at least 30 - 40,000 lumens for a decent grow

#15
jennybunny

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I have 150,000 lumens on 3 plants.. :smoke:


I have 150,000 on 5




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