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06-17-2005, 04:00 PM #2Senior Member
lumens
I found this on a grow guide -
Now for the big question. How much light do I need? Technology has advanced so much in the last 15 years that we are constantly refining the process and updating what we know works best for growing. Current theory holds that the minimum amount of lighting needed to sustain growth is around 2000 lumens per square foot. Mid range is around 5000 lumens per square foot. Optimal is 7000-7500, or higher, lumens per square foot.
As for types of fluorescent, you need both really, cool and warm. The cool ones are used for vegetative growth because they emit more blue light, and the warm ones are used in flowering because they emit more red light.
Do some more research on the internet before you buy anything.
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