600w vs. 400w HPS

Discussion in 'Indoor Growing' started by lJusticel, Oct 12, 2010.

  1.  
    lJusticel

    lJusticel Member

    Hey all. I'm fairly new to growing and i plan on starting a grow once I feel confident I've learned enough. I would like to know the ideal coverage area (sq.ft.) of a single 400w vs. a single 600w HPS. Thanks in advance for your replies.
  2.  
    420God

    420God Well-Known Member

    3x3' for a 400w
    4x4' for a 600w
  3.  
    rasputin71

    rasputin71 Well-Known Member

    Great timing on this thread. I couldnt decide which size to get for my 34" x 40" flower room. It looks like 400w will be OK, and will help so I dont overload my circuit it is sharing with the veg room.
  4.  
    lJusticel

    lJusticel Member

    Thanks 420God. Just the answer I was looking for. looks like I'll be going 600.
  5.  
    420God

    420God Well-Known Member

    You can go as big as you want as long as you can keep the temp down. I've seen people grow 2 plants under a 1000w in a cool tube. I personally have a 400w air cooled hood in a 3x3' tent.
  6.  
    420God

    420God Well-Known Member

    No problem, anytime.
  7.  
    pimpin paulie

    pimpin paulie Member

    i veg six in my veg room under 400w.and flower room is six under 1000w
  8.  
    420God

    420God Well-Known Member

    How's that 1000w offset your electric bill? Just wondering incase I upgrade.
  9.  
    oregon024

    oregon024 Active Member

    My flower rm is 5ft 6in square 2000 watts do it.Good ventalation and don't piss off the electric company
  10.  
    lJusticel

    lJusticel Member

    How about if I stagger my grow. Like flower 2 plants for a month before I put 2 more plants in. would the taller plants affect the light coverage on the smaller ones as there is only one bulb? I would like to harvest smaller amounts more often.
  11.  
    420God

    420God Well-Known Member

    Have to keep the veg and flower seperate. 18+ hrs for veg and 12/12 for flower and the light height has to be even or the plants will reach and stretch for the light.
  12.  
    lJusticel

    lJusticel Member

    Thanks for the info I've been lurking for quite a while now just reading everything I can. I already plan on vegging under a 400w MH in a seperate area. I suppose I could move the new plants higher to equal the height of the old plants.

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