Bake A Round

I just finished making my cool tube. I am not sure what the temp difference is but I know that the 400w hps ran for a hour and I could touch the glass and not get burned:cool: . I made mine for less than 80 bucks, I bought a aero-flo 6"duct fan on ebay for 35 bucks at 240 cfm, and bought a glass tube from michaels for about 5 bucks and spent 35 at home depot to wire and duct everything up. I am anxious to see how the skunk reacts under its new 400 hps rather than the 175mh that i had on it, but I couldnt install the hps because of the temp prob. Anyway hope this helps....

Just blowing air across the enclosed ducted light fixture at up to 539CFM WILL NOT cool the temperature of the lamp!!!....or the Room.

Don't be mislead!

My experince indicates that even a air cooled fixture will get no cooler that the temperature of the outside air source.

I have a 4x5 x9 room. In North Texas - it's in the 90'-100' outside during the day, right now.

I run a 549 CFM exhaust - drawing thru the 6" ducted air cooled fixture which is drawing the outside air from under the house crawl space.

Additionally -I'm running a small 5ton A/C unit at 78'. - Only fresh air is when I open the door.

I'm burning a 1000 HPS and I can adjust the light to any height in the room and adjust the room temps by 74' - 90' and have never seen over 90'

A 1000HPS puts off 3,200 BTU

It took three different air flow duct layouts to achieve this atmosphere. Drawing the outside air from an intake at the shingled roof area -was sending air temperature 94' to the light fixture and I couldn't get the room below 94'.

I got rid of the outside air FEED into the room and changed my Light fixture outside air source to 20' cooler from under the house.

this is turning into a great thread...good input to go with information...

hazey wonder...great find...I like that site...you just might have made me some money...lol lw

late how do you plan on cutting the tube?

You can cut the tube with a cheap glass cutter.

My cool tube holds 400 watts and my plants can touch the glass.

I use one 4 inch Can-Fan brand, one of which outsucked two of the competition in a test for the same supposed CFM. I believe the competition was Fantech. This one fan also supplies ventaltion for my veg section and mother section.