Quote Originally Posted by latewood
your question is vague... Even though you have been answered...Did you get the answer you were looking for?
What are you asking? do you want to know the minimum lumens per sf necessary to grow under?
Or, Do you want to know how many lumens to equal the sun's Output?
what rule of thumb are you asking about?

Glad to help, but didn't know what to tell you. lw:smokin:
Well, I meant how many lumens per square feet would be needed to produce some good bud that I'd be able to smoke and do other things with.
I think I'll be well short of matching the sun's output, I'll aim for half of that amount and try to develop the top colas.