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Watts per seedlings

Discussion in 'Lighting' started by DoctorDank, Dec 25, 2010.

  1. If you were to grow 75 plants from seed to seedling (2-3 weeks) how many watts of HPS light would you need? Would 2 400 watt HPS lights be enough seeing as they are only going to be getting 5-10" tall?
  2. 5-10 is not a seedling. seedlings need no more than a fluro. After a couple weeks when they are ready, then one 400 may work depending on how you pack them in. 2 may be better.

    I just judge my plants when they can go to HID. I believe the rule of thumb is when they have their 2nd set of leaves

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