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....