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What are Lumens? Everyday terms?

Discussion in 'Indoor Marijuana Growing' started by DevilRed, Sep 21, 2003.

  1. I see i should be adding up "lumens" when figuring out my lighting. Can anyone tell me the jist of this in everyday terms?

    How many does a plant use? How do I know how many my bulbs produce?
  2. =
    Lamp Type Watts Lumens per bulb Total efficiency

    Fluorescent Bulb 40 3000 400 watts = 30k lumens

    Mercury Vapour 175 8000 400 watts = 20k lumens

    Metal Halide 400 36000 400 watts = 36k lumens

    High P. Sodium 400 45000 400 watts = 45k lumens

    Do some math and you can figure the rest out :)
  3. Thanks

    But okay that said, what a plant need to grow? (how many)

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