how many plants under a 400 WATT HPS

Discussion in 'General Marijuana Growing' started by goodtimes2007, Jan 21, 2008.

  1.  
    goodtimes2007

    goodtimes2007 Active Member

    how many plants can be flowered in a 5x5 area utilizing a 400 watt HPS light? Thanks
  2.  
    grower1991

    grower1991 Active Member

    As many as you want. The more you grow, the less time you have to veg for.
    Id say 10 to 20.
  3.  
    smokinjs

    smokinjs Well-Known Member

    to get the right spectrum and even out the lighting.. i would say 6 to 8 tops. but im not an hps genious, filthy fletch or now know as "slappy boy" could answer this better.
  4.  
    smokinjs

    smokinjs Well-Known Member


    as many as you want? not good advice, if you throw 20 maturing plants under 400w the buds would be SMALL.........grower 1991 have you had much experience growing or is that just a total guess......i am curious because i grow with cfls, due to lack of space. but ive done plenty of research on all lighting.:peace:
  5.  
    goodtimes2007

    goodtimes2007 Active Member

    10 to 20 plants? your just saying throw them all in and the 400 watt hps would give them sufficient light? how long does the flowering stage last to get a good amount of yield, these are random seeds for sure.
  6.  
    smokinjs

    smokinjs Well-Known Member

    2 full months
  7.  
    goodtimes2007

    goodtimes2007 Active Member

    smokins, you suggest 6 to 8 plants? what kind of yield could one acquire off that many plants?
  8.  
    goodtimes2007

    goodtimes2007 Active Member

    would you be able to tell me if these plants are healthy looking and are on the right track for the near end of week 3.
  9.  
    smokinjs

    smokinjs Well-Known Member

    half ounce to an ounce from each plant would be a ballpark. lots of little things play into the totall outcome of the yield. ya just post a pic and ill take a looksi
  10.  
    goodtimes2007

    goodtimes2007 Active Member

  11.  
    smokinjs

    smokinjs Well-Known Member

    they look awesome goodtimes!! very full and healthy looking, you are right on track. the general rule of thumb for transplanting, when the plant is the same size or larger than the container it is in, then its time to transplant. so if let those veg for about 2 more weeks, then transplant, then its time to flower. unless you want some huge bushes then wait another 3-4 wks to start flower. hope this helps
  12.  
    grower1991

    grower1991 Active Member

    I've grown a bit. I've never used 400wt, but I do have a lot of experience with 1000 wt hps. I suggested a higher number of plants to maximize the production. The grow space is 5 feet by 5 feet, right? Thats a big space for one light. Instead of growing a few plants(which might not be good, considering you have unknown seeds) grow lots of plants. Move them around to rotate who gets the best light. Smaller plants mean less veg time, therefore less time in between harvests.
    I have personally grown 40 plants under a 1000 watt HPS light, no CO2 in a 4 foot by 4 foot space for just over a pound per harvest.
  13.  
    goodtimes2007

    goodtimes2007 Active Member

    was thinking, to clone them once they get a bit bigger and than test the clones to see if they are male or female... than i can decide what to do with the mothers.

    how long does it take for a clone to reach flowering stage? and could the clones be placed under a 400 watt hps?
  14.  
    smokinjs

    smokinjs Well-Known Member


    yes for maximum production i guess that would work. most people on this site grow for personal use only. so for us its kinda quality over quanity. :peace:
  15.  
    YungMune

    YungMune Well-Known Member

    you could probably do 10 plants with a 400 watt hps
  16.  
    jondog123

    jondog123 Well-Known Member

    Or you could grow 8-12 plants a little bigger to yield a pound and not have nearly as much work...:joint:
  17.  
    bfootball51

    bfootball51 Active Member

    can u mix cfls an how many would u need to flower got 5 3 blue 2 red but they get very hot only have 22in across an 23in front to back 4ft tall any ideals would be great thanks
  18.  
    kathleenbilly

    kathleenbilly Well-Known Member

    With a 400w HDS

    You want to be growing five plants max spaced within a square meter.

    Grown correctly and with good seeds (PPP) (Snow White) for example you should be yeilding 1.5 ounce per plant comfortably.

    hope this helps, KB:blsmoke:
  19.  
    T.H.Cammo

    T.H.Cammo Well-Known Member

    Let's see if I understand this right! You want to use one 400 watt HPS light to flower a 25 square foot area?

    That's only 16 watts a square foot - so I would say "None!".

    Actually, you would do better with about 9 square feet and reflective (mylar) walls to hold in all the usable light. Start with about 9 plants maximum.
  20.  
    kearners

    kearners Well-Known Member

    i dont know the most so bare with me but i read a thing the oder night sumwer nd it sed its best 2 have a 4 foot squareroom with a 400watt hps... im only sayin wat i saw, i havent grown yet so i cant givemy own opinion.

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