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Thread: Artificial lighting for CPs

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    Moderator Cindy's Avatar
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    Artificial lighting for CPs

    I used to have 3 shelves with all T5 HO setup. This year, I have reduced it to just 1 shelf while the other two will be LEDs. On a separate rack, I also have LED lamps (red/blue). All the setups are in ambient humidity which is consistently high by most standards.

    Reason for change: My original setups were rather unsafe. Tsk tsk... But it is also because I would like to try using LEDs for CPs...and much to the annoyance of Butch here as I will bug him on a daily basis about the what, why and how of LEDs.

    For the following readings on the meter, they are x 100 e.g. 116 x 100 = 11600 lux.

    For reference (wiki):
    1000025000 lux Full daylight (not direct sun)
    32000100000 lux Direct sunlight

    LED panel - meant for growing fresh water aquatic plants


    LED1 - notice the bluish tinge as the temperature colour is 7000K.




    T5 HO end - temperature colour is 6500K


    T5 HO middle


    LED2




    LED Lamps




    Cindy

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    Moderator Cindy's Avatar
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    Just for the fun of it...







    Cindy

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    Av8tor1's Avatar
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    LOL, you can definitely tell which is the white and which is the red/blue set.

    wish more people would do this, then over time we would have a better understanding of what "good" should look like
    just a gut instinct, but the white LED's (image 1) spectra looks like its needing help in the red wavelengths or maybe might more accurate to say a little heavy in the blue, but doesn't look too bad really...
    (based on my experience)

    Here is the signature of some 5000k German Narva fluorescent bulbs that performed nicely for me

    Have you tried adjusting the slit or angle to increase sharpness?
    Pretty fuzzy

    way to go Cindy!
    Last edited by Av8tor1; 02-06-2015 at 01:39 PM.

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    Moderator Cindy's Avatar
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    Hi Butch, thanks for the reference. I think it's my mobile phone that is the cause of the blur-ness. I'll be using my camera soon to see if the pics can be sharper.

    The first pic is of leds at 7000K. Could that be the reason why it is more blue?

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    Monkey's Avatar
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    How do you take those spectral photographs?
    Growlist
    IN HOC

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    sarracenia lover dionae's Avatar
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    Quote Originally Posted by Monkey View Post
    How do you take those spectral photographs?
    I think Butch posted this-spectrometer


    I'll try and take a pic of my LED light I have over my helis atm.
    Last edited by dionae; 02-06-2015 at 10:49 PM.

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    Moderator Cindy's Avatar
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    Dear Butch, I've tried my best...made 4 paper spectrometers...and the slit is as thin as possible...hope you are ok with the fuzzy photos...

    Sunlight at 6pm


    Left: Taken with mobile, Right: Taken with camera

    White LED 1


    T5HO


    White LED 2
    Cindy

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    Hello, I must be going... Not a Number's Avatar
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    We made those in high school with defraction grating sheets you could get from Edmund's Scientific. I may still have some sheet somewhere. We used razor blades to make the slit - two blades or you can carefully cut a doubled edged razor blade in half and tape them edge to edge over the hole. You can't get much of a straighter edge. You could also adjust the width of the slit for the best results. Blade -->] [<-- Blade
    Grand Hotel... always the same. People come, people go. Nothing ever happens.

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