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Can I use a 400W HPS in a 2'x2' grow tent?

Discussion in 'Indoor Growing' started by greenman28, May 29, 2010.


    greenman28 Active Member

    400W HPS = 50,000 lumens
    4 sq ft grow tent = 12,500 lumens per square foot.

    Will this be okay if I keep my temps cool?

    just8420 Active Member

    IDK but i would think that would be asking for a fire!

    im in a 3x8' space (24sq ft) and my 400w gets pretty hot

    also i dont think that you would have any room to grow in. if you have a pot thats a foot 6'' tall you only 18'' to work with.

    also a 400w hps is 50,000 lumens @ 1 foot away

    i think it would be like a oven!

    i'm sorry. just get a little more height and if you can control the temps it could work.

    BudsMckenzie Member

    depends on the real dimension of your grow space, your LxWxH. You're growing in a 3-D space, not a 2-D square. JUST is correct in assuming you have a limited growing space, 400w HPS will be to much. If you run a cool tube a 150w or even a 250w would be more than adequate for a plant or two in that space.

    cowboylogic Well-Known Member

    Its done all of the time. And the 50,000 lumens is right at the bulb. At 1 foot its already down to under 16,000. Heres a chart. View attachment 963522

    cowboylogic Well-Known Member

    He said grow tent guys. Most tents are at least 68 inches high.

    Humboldt14 Well-Known Member

    yea if you are in a grow tent as long as you have a cooltube air cooled hood and good ventalation you can def. use a 400 in your tent

    racerboy71 bud bootlegger

    i was looking into getting a four hundred to replace my now 250, and the guy at my local hydro store told me that it would be overkill unless i had a 3'x3' area.. anything less than that and he said that heat would really kill the benefits of the added lumens..

    Dezracer Well-Known Member

    I agree with cowboy and humboldt. With good ventilation and an air cooled hood you should be good to go. You will definitely need an air cooled hood or cooltube though, without one of those you'll be too hot and kill the plants.

    GrowKid88 Well-Known Member

    would it be okay to use 400w in a 2x2x5,7 for only the flowering stage

    Dezracer Well-Known Member

    Are you asking about a 2'long X 2'deep X 5'tall space?

    GrowKid88 Well-Known Member

    yes i am. i would use cfl for veg then use 400w for flowering.

    onelung Member

    im doing the same thing pretty much but mine is 5x2x5.... How many cfls are you using for veg?

    GrowKid88 Well-Known Member

    well i was thinking about starting off with two 42w and then just adding more as they get bigger. i did that before but i dont have that much room this time.

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