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Thread: How much light to I need?

  1. #1
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    How much light to I need?

    Sorry new here couldnt find anything on FAQ or stickies ..

    I built a wooden grow box with 4 cubic feet space inside. it is completly sealed ( exept exhaust and intake fans )

    How much light do I need ? is there a formula ?

    I ordered this kit :
    14 Watt Grow Light Kit - HomeGrownLights.com

    only 14 watts , is that enough ? if not can I get some suggestions please ?
    For my application should I use LED or HID ?

    - Should I Pad the interior walls with reflectors to reflect all the light in the box ?
    - how far should it hang above the plant ?

    - should it be directly above the plant or is it better to have several lights at the corners ?

  2. #2
    Cannabis Connoisseur The General's Avatar
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    Re: How much light to I need ?

    Here is a link that has tons of info on every aspect of growing. How to Grow Marijuana - Everything You Need to Know!


  3. #3
    Member of the Month Winner - October 2012
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    Re: How much light to I need?

    Quote Originally Posted by Diforce View Post
    Sorry new here couldnt find anything on FAQ or stickies ..

    I built a wooden grow box with 4 cubic feet space inside. it is completly sealed ( exept exhaust and intake fans )

    How much light do I need ? is there a formula ?

    I ordered this kit :
    14 Watt Grow Light Kit - HomeGrownLights.com

    only 14 watts , is that enough ? if not can I get some suggestions please ?
    For my application should I use LED or HID ?

    - Should I Pad the interior walls with reflectors to reflect all the light in the box ?
    - how far should it hang above the plant ?

    - should it be directly above the plant or is it better to have several lights at the corners ?
    total waste of money on that light.

    general rule of thumb is 40-50w per sq foot of area.

    seriously though, that light is nothing more than a frisbee.

  4. #4
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    Re: How much light to I need?

    thank you , I figured that light was BS , such a shame.
    anyway I plan on getting the Hydro grow 21X-PRO stick it inside a box and put Mylar film everywhere inside to maximize the light.

    Are there any auto-watering systems that are cheap and doing the job ? I dont want to nanny the plant ...

  5. #5
    420 Member Fuzzy Duck's Avatar
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    Re: How much light to I need?

    Quote Originally Posted by Diforce View Post

    Are there any auto-watering systems that are cheap and doing the job ? I dont want to nanny the plant ...

    Auto pots are self watering gravity feed system with a valve to stem water flow when pot reserva is full, thats the easy option.


    NFT, ebb & flow or dripper system which all in turn require a pump and reserva plus a nutrient change every 7 to 10 days & regular PH checking etc to prevent nutrient locks & assoicated problems.

  6. #6
    Member of the Month Winner - October 2012
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    Re: How much light to I need?

    Quote Originally Posted by Diforce View Post
    thank you , I figured that light was BS , such a shame.
    anyway I plan on getting the Hydro grow 21X-PRO stick it inside a box and put Mylar film everywhere inside to maximize the light.

    Are there any auto-watering systems that are cheap and doing the job ? I dont want to nanny the plant ...
    I HIGHLY suggest staying away from that company. In fact, you would be FAR FAR better off with a 100w Advanced LED Diamond Series which uses 92w and will fit in 2'x3' area. In reality I would say a DS 200w. But that is a few more bucks.

    In all seriousness though I would strongly suggest you take a look at this thread at an absolute minimum and learn a bit more about LED before you buy and blow good money on inferior products. There are some very good LED companies out there. Use this info and learn: Stevehmans LED guide.