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Thread: Light chart's

  1. #31
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    Quote Originally Posted by lkdj2003 View Post



    Spectrum:



    The diagram above shows the full range of light and where each type of lighting system falls within that range. Artificial lights produce just a slice of the full range. This leads to much discussion and experimentation to determine which, or which combination of lighting is best for a particular crop.

    Lets establish a reference point to work from, examine several types of lighting and put this information to practical use.

    Reference point: For most of the daylight hours, the outside daylight peak is centered on 5500 degrees Kelvin (refer to the above chart).

    Metal Halide: These lights emit a light on the bluish side of the spectrum. They are considered a grow light and it is considered that they produce a more stalky vegetative type of growth in plants. These lights are commonly used throughout all phases of plant growth and produce excellent results.

    Agro Sun Halide: Agro Sun is a hybrid halide bulb that generates extra red light for flower and fruit production. This is considered to be the best choice for artificial lighting of plants.

    Sodium Vapor: Sodium vapor lighting is way down in the red. There is some indication as well as a lot of marketing hype that the spectrum produced by these lights promote flowering. Personally, I'd like to see a scientific study to verify this.

    The bottom line on spectrum: Spectrum is secondary to the over all
    indensity. Remember, in any artificial lighting situation, we are able to
    provide only a fraction of natural lighting. Therefore, it is more
    important to provide intensity than any other lighting factor. For
    example if you have to choose between a 70 watt sodium vapor and a
    400 watt metal halide the only choice is the 400 watt system. The over
    all performance will be much greater, even if you favor a certain spectrum.
    Just to clarify, the first chart says you can have a 400 watt HPS at 6 inches?

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  3. #32

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    great thread and i found it most informative, any similar info available as to the use of CFL's ?

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  5. #33

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    I am a first time grower and (half way through flowering no) and have been using a Sunmaster Dual Spectrum Lamp (600w) throughout the grow. How do these dual spectrum lamps compare to having a specific veg lamp and then a specific bloom lamp? Will quality or yield suffer?

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  7. #34

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    Lumens per squar foot= 1,000 Good, 2,000 Better, and 3,000 best. Good luck and happy growing

  8. #35

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    Nice ill use this

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  10. #36

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    Some great info on this thread

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  12. #37

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    Quote Originally Posted by hotshot View Post
    Lumens per squar foot= 1,000 Good, 2,000 Better, and 3,000 best. Good luck and happy growing
    And one more thing, an HPS has 6 PAR per watt, this is what the plants see's. We see the lumens.

  13. #38

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    Lol. I think I have just twigged why my auto which is now nearly 7 weeks old isnt bursting out all over, great chart, thanks :-)

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  15. #39

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    Excellent post on light and lights

    Sent from my Nexus 9 using Tapatalk

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    Thanks for the info..

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