Light and Heat

E

Egadd

Member
Hi guys,
I hope I haven't missed the answer to this question somewhere.

Can anyone give an idea of what heat levels might typically be if you changed from CFL to HPS? For example, say a guy is running 20 individual 23w CFL in a 4x3x8 space. Temps. seem ok 65F @ night and 79F during the day w/a 5000 btu AC running. How much of an increase do the pros think you would see if you just tried to throw up a 600w HPS w/out any additional cooling/venting, taking out the CFL of course?
Sorry again if I've missed this answer in the archives but this is one HUGE site.

Thanks for any advice.
Egadd DaBowlisful
 
J

jkmovies

Active Member
If you can leave the door open and use two desk fans, you should be good for atleast a 250W, if not a 400W. Otherwise, forget it, it will burn your plants. You need atleast a desk fan blowing between your light and canopy, and another blowing air out to use a HID. A 600W or above would require ducting and an appropriate inline fan.

Of course if your a/c can keep it a steady temperature in there, you'd be good.
 
oregonism99

oregonism99

Member
Egadd said:
Hi guys,
I hope I haven't missed the answer to this question somewhere.

Can anyone give an idea of what heat levels might typically be if you changed from CFL to HPS? For example, say a guy is running 20 individual 23w CFL in a 4x3x8 space. Temps. seem ok 65F @ night and 79F during the day w/a 5000 btu AC running. How much of an increase do the pros think you would see if you just tried to throw up a 600w HPS w/out any additional cooling/venting, taking out the CFL of course?
Sorry again if I've missed this answer in the archives but this is one HUGE site.

Thanks for any advice.
Egadd DaBowlisful
Click to expand...
i use a 4x4x7 grow tent now, and use 2 120 watt leds and 2 65 watt cfls and 1 circulation fan on bloom. in my experience in order to rain down the light of a 600 it creates alot of heat. just an 8 ft. length of duct with a small inline fan would help by a great measure to expell the excess heat and keep fresh air circulating in the room. but make sure to keep your ballast in another room.
 
M

mrmadcow

Well-Known Member
your air conditioner will play a huge role in any heat increases.if it runs constantly now, you will see increases but if it hardly ever cycles on,you wont see any increase.
my guess is if you remote the ballast, the heat will be about the same as w/ the CFLs. add a cooltube & you might decrease the heat & time the air conditioner spends on.
 
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