Quote Originally Posted by karmaxul
Depends on the size of the area. 1500 lumens per sq. foot. There are other factors aswell such as CO2, spectrum, and envirnment. (god damn I wrote you last night and my posts are still getting erased, WTF)

Mothers will last forever on 24 hours light. That is why 18/6 is no good. The hormones get burnt out.
Your numbers are way off dude. I have tried to keep mothers for ever but they did not keep. 5 years was to long and she died on her own. The clones were fine from her but she had problem recovering the last year.

1500 lumens per sqft is not even close, you must have lumens confused.

Plants do best with 10,000 lumens to each plant or more. The old rule of thumb is 50 watts for every sqft but in truth that is still a little low but works.

18/6 light cycle is fine it saves a little money on the power and gives the plant a little rest. There is no measurable difference between a plant vegged at 18/6 and under 24/0 light. Advanced nutrients answered this question many years ago under lab conditions.