Originally Posted by sturgeongeneral
My current setup isn't air-cooled at all running 2k hps in a 9.5 long x 7 ft room. With a 81.75 inch floor to ceiling. After doing all the math, in order to run a cmh and still keep 24 inches between light and canopy I'm going to have to some how drop my tray. Overall height is 81.75". tray/stand/res is 23". Canopy to light 24". That's what I'm working with...
You still going to do 3 3x3 trays?
Ive been through a lot of what your trying to figure out. Heres some ideas I came up with.
First of all, go for the cmh and use phillips bulbs, if using the 315s or dual 315s. They will produce as good as hps de. Ive seen side by sides and they are close in total yield and quality. Cmh looked better to me. I told Isaac to go for them , and he crushed it, and replaced his whole room with them. They aren't light years ahead of any of the other light tech, but they are at the top with them in quality and production, and seem to produce superior resins, both trichomes and oils that are sticky/tacky on the leaf and bud itself.
Id go with 4 315s to cover 3x9. But if you want to match similar wattage as your 2k, then go for 6 315s, or 3 630s. ( im not against the 630cmh de's, I just don't have any experience with them, id refer to hammerhead in the cmh threads on those)
Now on the 7' ceilings and table height. Not sure what tables you have, but my quick fits can adapt to 4", or 12" with wheels. Also they can sometimes be flipped over to reduce height. Probably would have to do top feed dtw because of lowering the table, and maybe have to have a sump station for the drain water if you don't have a low enough access to drain plumbing.
If you go with horizontal positioned bulbs and hoods, then you can use the shallow hoods, or adjustawing types, that only sit about 6" from the ceiling.
Screw air cooled imo. Don't need the extra glass between bulbs, and you can cool efficiently enough as is with 2k of lights.
What else, distance from bulb to canopy... 24" would be nice, Isaac just mentioned he'd like to have 36" running a whole lit room of cmh. In your situation with a little more room space but not totally lit, 24" might be fine, but you will get heat or light intensity stress directly under the bulbs if you get much closer. You should stay around 18" away on the 315's.
Any more questions just holler.