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Thread: 400w vs 600w

  1. #1
    Unregistered Guest

    Default 400w vs 600w

    I'm getting the growlab 120 & was wondering what light will produce the best yields. I was thinking the 600 cuz hey more is better right? but I did sum research & found with 2 feet of distance between ur light & the canopy u divide the # of lumens by 4. So if u do the math u come to find out that a 600w hps at 18" away will actually only deliver 300w to ur canopy. While a 400w at 12" away will deliver more than 300w to ur canopy. I also was concerned with cooling the 600 would that be an issue?

    anyone with info on wut I should use?

  2. #2
    Witalog Guest


    For that size a 600w would be good and also always keep the light 2 inch above the top of plants for max use

  3. #3
    Join Date
    Jan 2011
    New Orleans, LA


    Yeah, bigger is better so long as you have room to accomodate plant growth. I'd go with the 600 if you have room.

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