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Thread: Ceramic Metal Halide

  1. #1

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    Default Ceramic Metal Halide

    Ceramic Metal Halide (CMH) Lighting



    AKA Ceramic Discharge Metal Halide (CDM) and Light Emitting Ceramic (LEC)

    As the name suggests this type of lighting is a development of the older metal halide bulbs where ceramic arc tubes are used instead of the traditional quartz glass. This allows a spectrum to be produced that can combine both the traditional metal halide and hps bulbs.



    Advantages



    Wide spectrum – the ceramic tube can withstand much higher temperatures and allows a wide spectrum of light to be emitted which is much closer to sunlight. This replaces the need for bulb specific spectrums i.e. MH and HPS

    Better PAR Efficiency – Traditional Metal Halide bulb had a low efficiency of 0.9-1.1 umol per watt ( light produced by a single watt of electricity). HPS is in the order of 1.5. CMH is pushing this up to 1.7-1.9 so electrical savings can be made

    Long Lasting – The ceramic tubes mentioned above are far more robust and allow CMH bulbs to run upto 24,000 hours. By 20,000 hours 80% of the output remains. Some hps bulbs have lives of just 10,000 hours.

    Ultra Violet – Know to have branching benefits in vegetative stage


    Disadvantages
    Flowering – while the lighting is capable of growing plants from seed to harvest, the red spectrum is limited compared with pure High Pressure Sodium bulbs so HPS can still outperform CMH in the flower cycle

    Ultra Violet
    – UVA,UVB and UVC are produced by CMH which is harmful to humans.

    Expense
    – The cost is approximately double that of traditional HID

    Heat – The spectrum produced is much wider than plants can see and this results in unnecessary heat although it is less than existing HID








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    Last edited by gardro; 19-02-19 at 04:32 PM.

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  3. #2

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    Default

    Here we have a popular 315W choice and PAR map. This would be great in a 3'x3' space. Very consistent across the space


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  5. #3

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    Default

    Nice read man.

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    gardro (19-02-19)

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    Default

    Interesting pal ,

    The dudes in the canaries use them straight onto the clones for 2 weeks then to the LED ......





    And they finish off with an HPS

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    gardro (19-02-19)

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    Quote Originally Posted by Wags View Post
    Nice read man.
    Cheers man

    Quote Originally Posted by Subterranean Man View Post
    Interesting pal ,

    The dudes in the canaries use them straight onto the clones for 2 weeks then to the LED ......





    And they finish off with an HPS
    Thanks mate, backwards buggers lol. With respect though commercial croppers are less likely to move away from what they are banking on.

    Lots are using hybrid combos too




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    Quote Originally Posted by gardro View Post
    Cheers man



    Thanks mate, backwards buggers lol. With respect though commercial croppers are less likely to move away from what they are banking on.

    Lots are using hybrid combos too




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    On the money man

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