What are Lumens? Everyday terms?

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

  1. #1 DevilRed, Sep 21, 2003
    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. #2 Stylez, Sep 22, 2003
    =
    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. #3 DevilRed, Sep 23, 2003
    Thanks

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

Share This Page