Results 31 to 40 of 77
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11-17-2007, 03:07 PM #31OPSenior Member
Ceramic Metal Halide Bulbs...for HPS ballasts?
Originally Posted by MaryLane
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....
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11-18-2007, 12:46 AM #32Senior 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.
Originally Posted by Dutch Pimp
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11-18-2007, 02:06 AM #33OPSenior Member
Ceramic Metal Halide Bulbs...for HPS ballasts?
Originally Posted by MaryLane
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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12-07-2007, 04:25 AM #34OPSenior 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.
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12-07-2007, 04:33 AM #35Member
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.
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12-07-2007, 04:54 AM #36OPSenior Member
Ceramic Metal Halide Bulbs...for HPS ballasts?
Originally Posted by Indico
Remember...the CMH bulbs are NOT to be used with digital ballasts...magnetic ballasts only.
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12-11-2007, 07:19 AM #37OPSenior Member
Ceramic Metal Halide Bulbs...for HPS ballasts?
Exhibit A. 4 1/2 weeks flowering...(I really should finish painting the walls...:stoned
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12-15-2007, 09:12 AM #38Junior 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?
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12-25-2007, 03:54 AM #39OPSenior Member
Ceramic Metal Halide Bulbs...for HPS ballasts?
Exhibit B...end of 7 weeks flowering.
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12-30-2007, 10:53 PM #40Junior Member
Ceramic Metal Halide Bulbs...for HPS ballasts?
so is this better than a hortilux?
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