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All BS set aside CMH yields

Discussion in 'Grow Room Design & Setup' started by Darth Vapour, Sep 24, 2015.


is it true or not

  1. yes

  2. no

Multiple votes are allowed.

    ganja361 Well-Known Member

    The really nice thing about ceramics is they are so good at bringing out colors and terpenes you don't have to cool the room to bring the traits out. I ran C02 until week 6 and 85 degrees and I had colas so purple they were turning black. After I turned the gas off I'm running 75 lights on and 65 lights off. It's been getting cold in Portland so even have turn the heat pump on sometimes.
    since1991 likes this.

    since1991 Well-Known Member

    Iam in Michigan. Freezing cold outside this time of year. I have a louvered intake that i strictly use for this time of year. I shut off my mini split the whole winter. I thought it crazy to run the room with the split on these months when its 25 degrees or lower outside. Saves me bucks. I have a six inch inline blower hooked to a simple themostat hooked to the louvered duct flap. Keeps it just as cool as the split...virtually no money spent. But anyways...sounds like a bunch of lec 's are going to replace my Gavitas...soon....real soon. It makes so much sense. And really..the whole hps spectrum from the very beginning was meant for fruiting crops in a greenhouse. Where the blues of the sun was plenty and the reds needed supplement. Makes sense that people are seeing improved crop quality totally indoors with lec spectrum. We used hps all these years because thats what we were told first off. All we had second (besides mh). And thats what gave us plump buds. But the whole hps spectrum was never ideal for the only light source.
    Last edited: Dec 30, 2016

    ganja361 Well-Known Member

    I would too but I like to keep my room sealed. Plus you have to if you're running c02. Or at least to best of your ability. Unless you like refilling tanks everyday.
    since1991 likes this.

    since1991 Well-Known Member

    I do use more co2 with the cold air intake in winter...but not by much. The intake louver opens up but sporadically. It drops the temp quick..then closes back up. I lose some co2 but its negligible at best. And worth it to not have the split running..throwing cash to the man every month.

    Chillums Well-Known Member

    Sorry to revive an old thread, just thought someone might be interested in my experiment. I wanted to know if I could run cmh's on standard high frequency electronic ballasts as there wasn't sufficient information out there pertaining to that.

    -2x400w hps
    -wing reflector
    -air cooled glass diy enclosed top
    -adjustable ballasts run at 300w(for 315 cmh)

    Lights ran without issue for two days. Then on the third day, as I was in the next room watching tv; all lights, tv, stereo all shut off for roughly five seconds before powering back on. I immediately checked the box and found the lights off. Everything else had turned on and worked fine except the lights in the flower box. After checking all breakers, fuses, panels and connections I switched the cmh bulbs for the hps; fired up no problem. The cmh bulbs are intact without any apparent alteration and no breakers blew there having been four between bulbs and main power. So I am inclined to believe the bulbs overheated emitted an EMP temporarily shutting off power to the rest of my house without damaging anything.

    p0opstlnksal0t Member

    Has anyone used one of these DEva setups yet?
    since1991 likes this.

    Kushman077 New Member

    Did you ever get a chance to record your harvest results??
    Last edited: Mar 8, 2017

    ganja361 Well-Known Member

    I did. I got 4200 grams on 5 lights. Came out to 1.33 gpw.
    disbeverk and GroErr like this.
    Bad Karma

    Bad Karma Well-Known Member

    I have all square wave ballast LEC's. When there is a black out/brown out/power failure in my neighborhood it takes the lights 20-30 minutes to comeback on line. I'm not sure if it's part of the design of the bulb, or the ballast, but LEC light will not strike when hot, thus the built in cool down period. I wasn't sure if you were aware of that, or not, so I thought it was worth mentioning.

    ganja361 Well-Known Member

    It's the ballast. New technology to save the bulb. That's why the good ballasts simulate a sunrise so to slowly warm the bulb.
    febisfebi and Bad Karma like this.
    MMJ Dreaming 99

    MMJ Dreaming 99 Well-Known Member

    PM me bro.

    davidcup Member

    Very good result no? Do you think it can be improved?


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