Air Cooling DE 945 CMH bulb

I am researching cool tubes for my room as I've struggled with the summer heat. I really would like to go with a dual end bulb for wattage and efficiency/intensity but don't want the heat . I know DE bulbs are superior for HPS in terms of efficiency, But they shouldn’t be cooled due to the nitrogen jacket being a poor insulator and thus allowing the temperature to shift with cooling and subsequently efficiency and spectrum suffering.

Now my question is:
Are DE CMH bulbs susceptible to the same problem? Or can they be air cooled without fear of losses (other than the glass in the fixture).

DE HPS lamps are filled with nitrogen gas around the arc tube where SE HPS lamps have a vacuum surrounding the arc tube. The nitrogen gas conducts heat better than the vacuum therefore you don't want to air cool them as it will cool the arc tube. The DE CMH lamps use a vacuum around the arc tube so you can air cool them directly and they actually sell reflectors just for that purpose, this is the first one that popped up:

You can disburse heat from any DE lamp indirectly, you simply have your air box sit on the backside of the reflector... I have finned heat sinks on the back side of my DE winged reflectors, and then those finned heat sinks are enclosed in a air box that blows cooled air through the air box which is then exhausted outdoors. There is always way to do something when you know you have to do something to manage all that heat when running 100 DE(s) in 40 x 40. And yeah maybe what I am telling you might sound crazy but it cut my AC bill in half doing that!

Can w

piratebug said:

You can disburse heat from any DE lamp indirectly, you simply have your air box sit on the backside of the reflector... I have finned heat sinks on the back side of my DE winged reflectors, and then those finned heat sinks are enclosed in a air box that blows cooled air through the air box which is then exhausted outdoors. There is always way to do something when you know you have to do something to manage all that heat when running 100 DE(s) in 40 x 40. And yeah maybe what I am telling you might sound crazy but it cut my AC bill in half doing that!

Click to expand...

Can we get a pic of this?

piratebug said:

You can disburse heat from any DE lamp indirectly, you simply have your air box sit on the backside of the reflector... I have finned heat sinks on the back side of my DE winged reflectors, and then those finned heat sinks are enclosed in a air box that blows cooled air through the air box which is then exhausted outdoors. There is always way to do something when you know you have to do something to manage all that heat when running 100 DE(s) in 40 x 40. And yeah maybe what I am telling you might sound crazy but it cut my AC bill in half doing that!

Click to expand...

Did you use screws through your reflector housing? Also did you used thermal paste?Or did you mount it the steel back plate. Sounds like a creative solution to steal the heat away.

piratebug said:

You can disburse heat from any DE lamp indirectly, you simply have your air box sit on the backside of the reflector... I have finned heat sinks on the back side of my DE winged reflectors, and then those finned heat sinks are enclosed in a air box that blows cooled air through the air box which is then exhausted outdoors. There is always way to do something when you know you have to do something to manage all that heat when running 100 DE(s) in 40 x 40. And yeah maybe what I am telling you might sound crazy but it cut my AC bill in half doing that!

Click to expand...

Definitely gotta show us how you did this. Lets see your handywork! What wattage of DE? 100 1kW DE's sounds a bit much for a 40x40. I could see it if they were SE's.

Renfro said:

Definitely gotta show us how you did this. Lets see your handywork! What wattage of DE? 100 1kW DE's sounds a bit much for a 40x40. I could see it if they were SE's.

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Ya that's less than 5ft spacing. In a 5ft grid they'd need 64 fixtures only for that space.

Yup just did the math sounds like bs to me you saying that you have more than 1 de per 25 square feet never have I seen this in all my years growing

piratebug said:

You can disburse heat from any DE lamp indirectly, you simply have your air box sit on the backside of the reflector... I have finned heat sinks on the back side of my DE winged reflectors, and then those finned heat sinks are enclosed in a air box that blows cooled air through the air box which is then exhausted outdoors.

Click to expand...

Still waiting to see a pic of this setup. Pics or it didn't happen lol!

Renfro said:

Still waiting to see a pic of this setup. Pics or it didn't happen lol!

Click to expand...

Lol I've thought of a cheap ass setup like this. But building a plenum sounds like a nightmare too much labour and it would look like an abortion unless you are a sheet metal worker. You can find the same AC/DE air cooled setup that sun systems sells for $500 for $40/hood in Ali Baba. But these fell out of style and all the HID guys in China are slowly switching to LED and they aren't making the indirect air cooled DE hoods anymore. But you can order them if you ask for 40+ units. Even at 40 units it comes out to the same as about 6 sun systems hoods lmao.