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....
MaryLane Reviewed by MaryLane on . Ceramic Metal Halide Bulbs...for HPS ballasts? Phlips MasterColor Ceramic Metal Halide ~ CMH ~ HPS-Retro White OK..techies...what does everyone think about this bulb? Rating: 5