What outdoor temperature is needed to cool a 600 watt hps

Ive never used hps and am going to be ordering a 600 watt setup soon.


So what temp outdoors would i need to keep the closet cool (80 F) enough if i am using a fan in the window to cool the lights ?

Thanks in advance

When it is 80 degrees outside my closet gets 85 F...any higher than that i need an A.C with 500 watt cfl. So the question is at what outdoor temp could i put in an hps without cooking my plants and keeping them around 80 F.

Obviously i could wait until im setup then find out what temps work but im trying to decide how i will run their light cycle and how much longer into fall/winter i have to get.

when its about 60- to low 70s my 600 can run fine with a 400cfm fan and filter and it stays about 79-81 dergrees. the real trick is having a hood cooled light and an inline fan, outside temp does matter but the other 2 are much more important, if nothin else get an inline fan, they are what matter, hope this helps later

my grow room stays about 8~10deg above ambient