100W CFL Generating alot of heat!

DB&ST

Well-Known Member

• Nov 21, 2010

• #1

just set up a new growbox, it has two 50W CFL's (6500K) in it..
and it doesn't have any ventilation in it..

the temps go up above 80F in 10 min.. im afraid that the growbox is going to overheat..

should it get so hot in with 2 50W CFL's and no ventilatio?

 

jondamon

Well-Known Member

• Nov 21, 2010

• #2

If you have no ventilation then what do you expect?

You have no escape for your heat.

CFL's generate heat just not a great deal of it. If you have nowhere for the heat that is created to go then it is just going to get hotter in there.

You need an exhaust at least to get the hot air out.

J

 

DB&ST

Well-Known Member

• Nov 21, 2010

• #3

it's a small cardboard box.. kinda hard setting an exhaust in there..
a small wooden box with a normal fan inside would still overheat?

and how high can the temp go and still be ok to grow?

 

fraiserblaze

Active Member

• Nov 21, 2010

• #4

for sure you need some kind of venalation heat stress can stunt a plants growth , heat can be a bigger issue than most people think . Try using a pc fan for a exhaust best of luck

 

DB&ST

Well-Known Member

• Nov 21, 2010

• #5

fraiserblaze said:

for sure you need some kind of venalation heat stress can stunt a plants growth , heat can be a bigger issue than most people think . Try using a pc fan for a exhaust best of luck

Click to expand...

you think i should continue with the cardboard box? im afraid that it will burn if it's too close to the CFL's..
and i think i can get a little exhaust fan in there if it;s going to make the difference..

 

pitbudz87

Well-Known Member

• Nov 21, 2010

• #6

here is what u do cut yourself a passive intake in the bottom and put a screen to keep out bugs and get yourself a fan in there moving air and make a hole in the top of the box on the oppisite side of the bottom hole and see what happens

 

jondamon

Well-Known Member

• Nov 21, 2010

• #7

This design may help you add an exhaust to your box

see pics below

I use this as a drying box but you could do the same for growing if you want to stay with the cardboard box.


J

 

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DB&ST

Well-Known Member

• Nov 21, 2010

• #8

Thanks! i'll buy a VENTS 100S and see how i can feet it in and how much it will take the temp down..

 

jondamon

Well-Known Member

• Nov 21, 2010

• #9

PC fans would take the temps down.

I currently use a 200w ECO CFL for VEG and MOTHER box that i designed and i use 120mm PC fans as an INTAKE and EXHAUST

See pics below


J

 

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fraiserblaze

Active Member

• Nov 21, 2010

• #10

jondamon said:

This design may help you add an exhaust to your box

see pics below

I use this as a drying box but you could do the same for growing if you want to stay with the cardboard box.


J

Click to expand...

lovin the box !!!!!!!!!!!!!!! Nice setup if I knew how to give you rep I would .

 

fraiserblaze

Active Member

• Nov 21, 2010

• #11

db&st I would for sure go with something like jondamon has shown you that's a really sweet setup on a box !!! Even if you can't get your gear now at least cut a vent hole in both the top and the bottom you should do fine

 

jondamon

Well-Known Member

• Nov 21, 2010

• #12

fraiserblaze said:

lovin the box !!!!!!!!!!!!!!! Nice setup if I knew how to give you rep I would .

Click to expand...

you click on the little star shaped icon under my name.

that is just my drying box that i use to dry my buds.


J

 

bigv1976

Well-Known Member

• Nov 21, 2010

• #13

CFLs produce alot more heat than people think they do but your box would over heat with a candle in it if there is no ventilation.

 

fraiserblaze

Active Member

• Nov 21, 2010

• #14

I did it . I'm excited like a kid who just learned something new . So thanks a million jondamon your the man !!!!!!!!!!!!!!!

 

DB&ST

Well-Known Member

• Nov 22, 2010

• #15

bought this exhaust fan.
is says it's 1.9 m^3/min.

what will do better for the grow box?
make it exhausting the hot air, or making it get fresh air inside?

 

S

SmokinJoe113

Active Member

• Nov 22, 2010

• #16

Id be scared to put a light in a cardboard box, CFL or not. Just my .02

 

DB&ST

Well-Known Member

• Nov 22, 2010

• #17

SmokinJoe113 said:

Id be scared to put a light in a cardboard box, CFL or not. Just my .02

Click to expand...

me too..
the box is temporary until i manage to build a normal cabinet..

 

jondamon

Well-Known Member

• Nov 22, 2010

• #18

if you are using that fan then it should be used as an exhaust.


J

 

DB&ST

Well-Known Member

• Nov 22, 2010

• #19

Thanks!
and with a hole at the bottom you think it'll be fine?

 

Cheap Basterd

Active Member

• Nov 22, 2010

• #20

DB&ST said:

Thanks!
and with a hole at the bottom you think it'll be fine?

Click to expand...

Yeah mate you'll be fine.

I'm only a noob here, it's fairly simple though. With the fan at the top of your box it will draw cool air through the hole in the bottom. If you put the holes at opposite sides it will draw cool air over your plant too.

Good luck