Advice- horizontal or vertical CMH fixture

Discussion in 'General Marijuana Growing' started by turbobuzz, Dec 8, 2018 at 4:23 PM.

  1.  
    turbobuzz

    turbobuzz Well-Known Member

    Ok, I'm taking the leap soon from cheap led to CMH 315, but I can't find anything that really says if horizontal or vertical fixtures are best. Any advice? Looks like the horizontal fixtures are cheaper. Going to be used in a closet where the door remains open, so I'm thinking heat can be managed.
     
  2.  
    Lordhooha

    Lordhooha Well-Known Member

    Phillips bulbs were designed to be done vertically if I remember correctly.
     
  3.  
    DemonTrich

    DemonTrich Well-Known Member

    There is NOT a single bulb company that designs their bulbs to operate flat or vertical. Its NOT cost efficient. They (phillips) make a t9 and a t12 style bulb. 1 made for sealed/ac hoods, the other for open hood/bare bulb setups.

    3yrs long time cmh user before it became popular
     
    Thundercat and Lordhooha like this.
  4.  
    Thundercat

    Thundercat Well-Known Member

    The direction you hang it depends heavily on the size and shape of your canopy from my understanding. You want the light directed at the canopy . In vertical grows or with bushes vertical bulbs make tons of sense. If you've got a flat garden with an evenish canopy I think horizontal with a reflector makes a lot more sense.
     
  5.  
    turbobuzz

    turbobuzz Well-Known Member

    So what reflector do you recommend. Vertical or horizontal? I'm leaning towards vertical.
     
    DemonTrich likes this.
  6.  
    xtsho

    xtsho Well-Known Member

    A vertical is going to take more of the height space
     
    DemonTrich likes this.
  7.  
    DemonTrich

    DemonTrich Well-Known Member

    I used all my old hps/my hoods. So mysetup will be different than most. It works for me 100%. All are air cooked, big kahuna hoods kept about 2' max from canopy tops.

    4x315 cmh all Philips 930 bulbs (1265w total)
    1 week after flip

    20181121_192920.jpg
     
    thumper60, Thundercat and xtsho like this.
  8.  
    turbobuzz

    turbobuzz Well-Known Member

    Shit, that's massive. I'm talking a couple plants in a closet. Sounds like horizontal is my best bet, and they are cheaper.
     
    DemonTrich likes this.
  9.  
    DemonTrich

    DemonTrich Well-Known Member

    Do NOT buy a prebuilt setup. Use your brain, piece it together to suit your needs. It's easier than you think.

    Any hood will work
    Cmh to mogul socket adapter
    Cmh bulb
    Cmh ballast

    Done
    Easy peasy!
     
    xtsho and Thundercat like this.
  10.  
    xtsho

    xtsho Well-Known Member

    I just looked at pricing that. Not that bad price wise to convert until you add the price of the bulb. I've thought about CMH but would a 315 CMH be any better than a 600 watt HPS in a 4' x 4' tent?
     
  11.  
    DemonTrich

    DemonTrich Well-Known Member

    Swap 1x600 for 2x315 cmh.

    Raptor makes a dual mogul socket hood.
    Put 1x942 and 1x930 bulb and kill it!
     
    Thundercat likes this.
  12.  
    turbobuzz

    turbobuzz Well-Known Member

    I think I've about decided on the Hydrofarm Phantom. The ballast can be outside the closet reducing heat even more.
     
    Bad Karma likes this.
  13.  
    DemonTrich

    DemonTrich Well-Known Member

    Prism ballasts

    Exact copy of Philip's ballasts. I use 7 of them.
     
  14.  
    DemonTrich

    DemonTrich Well-Known Member

    Not really, you'll need 2 bulbs. Then you would (should) exceede your 600 harvest weight.

    I went from 3x600 yo 4x 315 in the same room. I pull the same if not slightly more weight now, but using less power.
     
    Thundercat likes this.
  15.  
    Bad Karma

    Bad Karma Well-Known Member

    I use three Phantom CMH 315’s in my garden and they’ve worked out wonderfully. Remote ballasts are definitely the way to go if you want to keep temps down in your grow space.
     
    turbobuzz likes this.

Share This Page