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  1.     
    #31
    Senior Member

    Ceramic Metal Halide Bulbs...for HPS ballasts?

    Quote Originally Posted by MaryLane
    Hey Dutch how much heat is your lamp giving off? Is it aircooled? How far can you keep it from your plants?
    1. My setup is in a closet. I pump cool air between the top of the plants and the bottom of the light, 24/7. The air comes from my central heat/ac floor opening, using 6 inch dryer-duct hose. If it gets cold at night, it adds heat. I don't have an exhaust system, it's not nessary in the fall/winter/spring, and I don't try to grow in the summer. The excess heat returns to the H/AC system. I maintain 70-85 degrees and 40-50% humidity.

    2. The CMH bulb doesn't throw the heat down like the HPS hortilux bulb. So I can get it closer; say 8-10 inches as opposed to 12-15 for the hortilux. If I hooked up an exhaust system to my lamp housing, I could maybe get closer still. It was an option, I didn't get........should have.

    This works great for my small personal grows....

  2.     
    #32
    Senior Member

    Ceramic Metal Halide Bulbs...for HPS ballasts?

    Ahh cool. Sounds like a nice set up.

    I am trying to decide if I want to throw my CMH 400w in a DIY bake a round cooltube or leave it open. I am doing a barrel style vscrog so the distance to the plants is fixed. Right now I am planning on a 20" diameter screen, which puts the radius at 10". I think I amy do the cooltube and reduce the diameter to maybe 18" or so.

    What do you think? I will have plenty of ventilation either way, and my ambients never go above 75F, usually staying around 71F.



    Quote Originally Posted by Dutch Pimp
    1. My setup is in a closet. I pump cool air between the top of the plants and the bottom of the light, 24/7. The air comes from my central heat/ac floor opening, using 6 inch dryer-duct hose. If it gets cold at night, it adds heat. I don't have an exhaust system, it's not nessary in the fall/winter/spring, and I don't try to grow in the summer. The excess heat returns to the H/AC system. I maintain 70-85 degrees and 40-50% humidity.

    2. The CMH bulb doesn't throw the heat down like the HPS hortilux bulb. So I can get it closer; say 8-10 inches as opposed to 12-15 for the hortilux. If I hooked up an exhaust system to my lamp housing, I could maybe get closer still. It was an option, I didn't get........should have.

    This works great for my small personal grows....

  3.     
    #33
    Senior Member

    Ceramic Metal Halide Bulbs...for HPS ballasts?

    Quote Originally Posted by MaryLane
    Ahh cool. Sounds like a nice set up.

    I am trying to decide if I want to throw my CMH 400w in a DIY bake a round cooltube or leave it open. I am doing a barrel style vscrog so the distance to the plants is fixed. Right now I am planning on a 20" diameter screen, which puts the radius at 10". I think I amy do the cooltube and reduce the diameter to maybe 18" or so.

    What do you think? I will have plenty of ventilation either way, and my ambients never go above 75F, usually staying around 71F.
    Hi.

    I'm not a light expert or anything, but these bulbs are rated for open fixtures. They have X-amount of Uv block built into the glass bulb. If you need to use a cool tube, select the proper kind of glass tube or you will block too much of the Uv light; which the plants love.

    A fixed light distance; is a over-my-head growing style. I adjust my light distance daily......and scrog is too. I just let them puppies grow. I have plenty of height distance to work with.

    Bottomline: Everbody's grow room is different, so I usually avoid giving advice, but the key is to test everything in advance, I think. Keep temps between light and top of plants around 75-80 degrees; with good air circulation, that is good common advice....enjoy!

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  5.     
    #34
    Senior Member

    Ceramic Metal Halide Bulbs...for HPS ballasts?

    The thread about MH in flowering, reminded me that I am at the end of 4 weeks of flowering with the CMH bulb.

    2 female white widows under a 400 CMH bulb. Still don't have a digital camera, but went shopping for one today. Maybe after the weekend, I will have some pics available.

    Anyways, their 3 foot tall and doing very well. Which is about a foot shorter than the last grow under a 400 HPS Hortilux, everything else is the same; nutes, etc.

    I like this bulb.

  6.     
    #35
    Member

    Ceramic Metal Halide Bulbs...for HPS ballasts?

    I'm really thinking of getting just an HPS ballast with a CMH bulb, if I have any doubt about CMH it's in the flowering stage, so let us know how much you got, peace.

  7.     
    #36
    Senior Member

    Ceramic Metal Halide Bulbs...for HPS ballasts?

    Quote Originally Posted by Indico
    I'm really thinking of getting just an HPS ballast with a CMH bulb, if I have any doubt about CMH it's in the flowering stage, so let us know how much you got, peace.
    Yea...that's the $63 question. How does it do in flowering? It does great for 4 weeks. The final 4-5 weeks?...we'll see.

    Remember...the CMH bulbs are NOT to be used with digital ballasts...magnetic ballasts only.

  8.     
    #37
    Senior Member

    Ceramic Metal Halide Bulbs...for HPS ballasts?

    Exhibit A. 4 1/2 weeks flowering...(I really should finish painting the walls...:stoned

  9.     
    #38
    Junior Member

    Ceramic Metal Halide Bulbs...for HPS ballasts?

    i noticed that you are warning the use of e-ballasts, so I have been lookin around and came up on this

    http://www.hydro-techn.com/showcandle/newscan.html

    I feel that this bulb will produce more yeald per watt, no? Is your progress anything above average?

  10.     
    #39
    Senior Member

    Ceramic Metal Halide Bulbs...for HPS ballasts?

    Exhibit B...end of 7 weeks flowering.

  11.     
    #40
    Junior Member

    Ceramic Metal Halide Bulbs...for HPS ballasts?

    so is this better than a hortilux?

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