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Green light in grow room?

Discussion in 'Indoor Growing' started by GreenGro, Apr 26, 2007.


    razoredge Well-Known Member

    shit just any party light is fine man.. has to be green..

    Booster Member

    I want to use a green light to provide heat during lights off period. My growbox is in a unheated space. I know they use light bulbs as pumphouse heater so pipes wont freeze. I would think a incandesent would provise more heat than a cfl. a 100 watter would keep my plants warm...no????

    ganjajoe420 Member

    i have used a green cfl twist bulb for about 2 years now, ive left it on all night before, if you see green light, doesnt matter what kind, if you see green light, so do your plants, thats all that matters, quite obviously the lower wattage the better, never had male flowers forced because of it being on, led green light is the best, but cfl is good too, like i said 2 years ive been using one

    mr.smileyface Well-Known Member

    you really think jorge would lie to you?

    OldManPot New Member

    i use 3 25w green party bulbs in my flowering room, and can see as well as with a 60w white bulb

    dugi Member

    i need help I'm rookie

    i need help I'm rookie Active Member

    Can i ask why anyone would want to bother the ladies while they are sleeping? Do you like to be bothered when you sleep? yes any green light just the lowest watt is the best, But just for emergancys. Why do you need to go in there, there is no feeding,spraying or clipping in the dark not good for the plant at all!!!!!!

    dugi Member

    100% corect~!
    i need that light for emergancys - so i did it
    but do it just if you must!

    Nastydroaste Well-Known Member

    Well sorry for opening up this thread again, but for those who are interested, I did a little experiment in my college biology class a while back that might shed some light. It involved putting transparent pieces of material with different colors on some plant leaves (forgot the plant name). The green transparent strip of material actually blocked the light causing the plant to turn a yellow white color within a couple of days. So I am guessing that the green does have an effect on the plants ability to absorb light. Ive got bugs, so I need to go in there in the dark and spray them.

    Dethryn Member


    sixstring2112 Well-Known Member


    stumps Well-Known Member

    So if any green blocks light. Why are so many green houses made with green covering?

    sixstring2112 Well-Known Member

    not always green, sometimes they paint them with what is call white wash. the sun is WAAAAY stronger than hid lights, its so it does not get too hot in the houses. the white wash or green will slowly wash off during the summer and let the sun back in in the fall. so yes, its green to block out the light from the plants.I'm the jackass that used to have to paint the roof:clap::clap:

    stumps Well-Known Member

    not sure but I don't think the canvas stuff fades. says it's good for 4 years. I was just looking at them.

    Prot3us1 Guest

    lol, leds are tuned by nanometers...its the nanometers that determine color..therefore by applying green filter material any light not in the correct "nm range" is not allowed to pass through. Hence why a 60w green light is so dim compared to 60w with no green filter.

    I believe the bst color green to use, is the same color as the leaves themselves. The plants reflect ALL green light, that is why they look green to us. They absorb other colors for energy.

    Sorry to burst ya bubble, i DO see your attempted logic...leds seem so perfectly green whereas incandescent with green dye seems like a messy messy solution, but at the end of the day same deal...as others said green light is green light... "green light" actually just means "only light in the spectrum correct for green is reflected".

    Green Light

    The visible green light has a wavelength of about 510 nm. Grass, for example, appears green because all of the colors in the visible part of the spectrum are absorbed into the leaves of the grass except green. Green is reflected, therefore grass appears green.

    So scientifically if you had a light the EXACT color of your plants, you could have 150000000000giga-watts and apart from vaporising everything in the room from heat, you would have no effect on the plants. Also, think about what this means for nitrogen deficiency etc...If the leaf is yellow its actually absorbing green light! Its then not absorbing yellow light, and what color is my hps? So when i get N def not only am i starving the plant, im also losing efficiency from my lamp!. So if you are budding and have yellow leaves, perhaps this isnt a good idea?

    fearnoevil likes this.

    Prot3us1 Guest

    And also, in the dark is exactly when you should "spray". spraying during lights on with HIDs will burn your leaves.

    St1z Member

    wont spraying when the lights are off promote mold growth?

    braintumor Member

    not if you have a slight breeze and good ventilation
    guy incognito

    guy incognito Well-Known Member

    No I don't, but if someone HAS to perform some maintenance work in my bedroom while i'm sleeping I would prefer they do it in a way so as not to wake me up and stress me out.
    Abucks likes this.
    guy incognito

    guy incognito Well-Known Member

    I think you missed the point. Green doesn't block light. Light is made up of a large range of frequencies, each correlating to a certain color in the visible spectrum. The frequencies in the "red" and "blue" light is absorbed by the plant and used. Frequencies in the "green" part of the spectrum are not absorbed, instead they bounce off the plant. This is why a plant looks green - it's bouncing all the "green" light off it and into your eye.

    So if a green house was covered with green all that useless light in the "green" frequency range is reflected away, hence why it appears green. The useful frequencies of light are allowed to pass through and get to the plant. Now you have a green house that keeps heat and moisture in for the plants, but doesn't bake like an oven because you are filtering out excess sunlight that is useless to the plants.
    stumps likes this.

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