How Many Wattz Do I Need?

Discussion in 'Newbie Central' started by youngbuck9992003, Jun 27, 2006.

  1.  
    youngbuck9992003

    youngbuck9992003 Active Member

    This is my first attemp to grow i was wondering How much wattage would i need for 1 plant in a 2X2 space?? Can i use to much light???? :fire:
  2.  
    rollitup

    rollitup Forum Admin Staff Member

    The easiest way to think about it is when you are growing marijuana you will need about fifty watts of HID lighting per foot. This assumes that your garden is square, try to use this as a principal.

    1 250 watt two foot by two foot garden.
    1 400 watt for a three foot by three foot garden.
    1 600 watt for a 3.5 foot by 3.5 foot garden.
    1 1000 watt for four foot by four foot garden.

    All you have to do to make that general rule work is line your walls with flat white paint or mylar to make sure your garden gets ample coverage, also try to make sure the lamp has a good reflector on it.

    That should get you started :weed:
  3.  
    darryl

    darryl Active Member

    if i have a 15 watt flourescent light and a 50 watt flood light over my plant is that enough for it to grow (in the vegetative stage)?
  4.  
    ViRedd

    ViRedd New Member



    Get rid of the flood light. It has the wrong color spectrum and pumps out way too much heat. The 15 watt floro is just barley enough to grow seedlings and cuttings with. See rollitup's post above.

    Vi
  5.  
    Brainfreeze676

    Brainfreeze676 Active Member

    grow using plant growth lights with a blue spectrum during vegetation cycle on a 18/6 light cycle. you want a 125 watt for begginers.it works fine and just have foil around the area and it will work fine..b careful of the temperature though keep it regular
  6.  
    Heliotropic chaos

    Heliotropic chaos Active Member

    I once got my seedlings going on the window sill, with just an 11w CFL(one of those energy saving light bulbs).. It took a fair while longer than the 125w CFL I have now, but if ya skint and want to get some seeds on their way..

    I think they were about 3 inch high after a month. That was in summer too, so maybe the best of it was from the sunshine. I totally support BrainFreeze sayin buy proper horticulture lights. This is my second grow with proper CFLs and the difference from shop lights is noticable in both growth speed and quality.
  7.  
    fat sam

    fat sam Well-Known Member

    if you went with a 250 mh or hps you would have 1 kick ass plant with some nice nugs, skip the cfl's if big gooey nugs are what you desire
  8.  
    blazinbudsforever

    blazinbudsforever Well-Known Member

    yea HPS !! go straight for a 400, then you can add more plants
  9.  
    mac17

    mac17 Member

    hey whats up im new on this so but i was wondering do u think its safe to buy seeds of the internet i live in northern california i need help
  10.  
    mac17

    mac17 Member

    hello there wats up hey well my name is luck i live in northern california well i wanted to khow on the rule of watts and feet is there a limit on how many plants i can put in a 3 by 3 foot space can u help me out
  11.  
    ihategreennot

    ihategreennot Member

    my first grow i used a 75 watt flood light i had it to high so the plant streched in lake of light i did one plant but it got to be 4 feet or more it was really crystaly but dont get the light to close it will get to hot and fry the top of it only 3 months in it had about an oz but for a first it was a nice one 70 watts is the lowest but you aren goin to haul as much with a lower watts higher the watts the fatter the plant i say
  12.  
    ihategreennot

    ihategreennot Member

    my first grow i used a 75 watt flood light i had it to high so the plant streched in lake of light i did one plant but it got to be 4 feet or more it was really crystaly but dont get the light to close it will get to hot and fry the top of it only 3 months in it had about an oz but for a first it was a nice one 70 watts is the lowest but you aren goin to haul as much with a lower watts higher the watts the fatter the plant i say
  13.  
    Illegal Smile

    Illegal Smile Guest

    The sun puts 10,000 lumens per sq ft on a sunny summer day. Half that is great for indoor plants. I use cfls because of heat. My 2 sq ft bubbleponics gets 275w actual. That's more than needed. It is divided in veg with 190w 6500k and 85w 2700k. In flower that is reversed. Once beyond seedlings I keep lights 2-3 inches from plants.
  14.  
    MJ4ever

    MJ4ever Member

    so what U r sayin , is more light bigger better buds ???? cause im thinkin also on surronding , my plants with flourscent grow bulbs also all around the plants. would that make a difference, or would i just be wasting electric ?????

    MJ4ever
  15.  
    wallstreet

    wallstreet Member

    More light is always better for the plant. Your plant will grow new limbs to use the new light and fill in. If yer not worried about the electric bill or cost of lighting, put as much as ya can.
  16.  
    bigv1976

    bigv1976 Well-Known Member

    Yeah cram a 400 in there and fight heat like a firefighter for the rest of your grow. Great advice.
  17.  
    r1tony

    r1tony New Member

    Ya I am in that situation now!! Was veggin with CFL (2- 26watt 6500k for each plant (2 plants)) and temps were low 80's. My closet is 48w x 40h and 26 deep and the temps since I fired up my 400watt HPS in there are 93-100 with 4" inline duct intake fan and 6" eco can fan pulling air right at light hood. I bought one of those little Stanley blowers to blow into my 4" duct fan and the temps dropped to high 80s to 90 but still tad high for me. Just becareful when you go you need a plan for heat dispersion.
  18.  
    thedude27

    thedude27 Active Member

    You can easily cool a 400 in that space, if you get a real fan. I was pulling 400 cfm in my micro grow on a 400 hps and a bunch of clf's with no cool tube and was easily maintaining 72-75. If you cheese out on the venting, yea you'll burn it up. With a cool tube you'd probably need 1/2 that. I just didnt have room for one.
  19.  
    Macinfo

    Macinfo Member

    Is foil safe? I read the light refracting off of it can cause small burn holes in the leaves, and it's better to use plain white paper


    @MJ4 think of it like this man - plants eat light, and they are some greedy fuckers. However much you give them, they'll just keep eating and growing. The only thing you have to worry about is keeping the temperature from the light down, too much heat can cause them problems.
  20.  
    gabeyjoe

    gabeyjoe Member

    can you grow about 5 of them under a 42 watter?

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