High Pressure Sodium or metal halide?

Discussion in 'Lighting' started by BEn1990, Oct 22, 2010.

  1. #1 BEn1990, Oct 22, 2010
    for the veg growth?

    obvioustly metal hilide is better for this stage but ive herd a few people say HPS does the job well.

    what are the drawbacks of using HPS lamps for the veg state?
     
  2. #2 The Green Bastard, Oct 22, 2010
    it's not the right spectrum so the growth will not be nearly as good as it would be under a MH.

    Will a HPS work to veg? yes
    Is a MH better for veg? yes
     
  3. #3 High as Space, Oct 22, 2010
    chlorophyll activity (1).gif


    I have a HPS and a MH light, and im currently using the MH on my seedlings
    is it a good idea to hook up the HPS light every now and then to balance the spectrum or is using only a MH just as good?
     
  4. #4 The Green Bastard, Oct 22, 2010
    for veg, the MH is all you need.
     
  5. #5 heaphyhigh, Oct 22, 2010
    It has been shown that a 5-10% increase in yeild has been achieved in using a combination of HPS and MH during bloom with a ratio of 2:1 respectively. *

    * I can't reference online, but can reference to a published book called "Integral Hydroponics"
     
  6. #6 High as Space, Oct 23, 2010

    ok so a mix of both may be beneficial for flowering, but not for veg.
    thanks for the info guys.
     
  7. #7 toastybiz, Oct 23, 2010
    A mix of both, yes. But that does not mean running HPS only one day and MH only the next...
     
  8. #8 smoove, Oct 24, 2010
    HPS all the way. No need at all to make an extra bulb purchase.

    :smoke:
     

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