JimiC

ack .. no time to make the graphic and post .. work nearly over for today

but, youre forgetting option 3 !!

will post when i get home

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JimiC

k .. here i am at home .. and heres option 3 ..

a single exhaust fan, drawing air from the grow box around the exhaust vent of the lamp. its probably not as efficient as option 1, but its simpler. as long as the main exhaust fan draws a lot more than the fan in the lamp, i think it would work fine, the main exhaust removing the exhaust from the fan before it gets into circulation, whilst maintaining flow through the rest of the box ..

Attached Thumbnails

 

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Crapon

Thanks for the responses.

I am going to go with option 1. Seems like the best heat transfer without letting any humid air or dirt or the like into the light cooling chamber.

Thanks JimiC for the 3d diagram. A picture is seriously worth about a couple hundred words. The problem with that, is that the 1000watt light puts out a ton heat, and there needs to be a wind tunnel effect going around the light or else it will burn up. Your solution would only suck all of the radiating heat away, keeping the grow space's temps down, but the light would fry real quick. If I were only using a 400watter that is probably the better solution. Thanks for the input.

Crapon

Uncle-al, thanks for the insight on the humidity thing, totally looked that over when deciding on the options. Definitely a must to keep the air sources seperate.

The only thing that puzzles me a little is your concept of "too much air is bad". The more air you have flowing through the housing the better. The light is constantly radiating heat, and the air sucks it away before it has a chance to heat the air it just heated. So essentially you are completely eleminating heat radiation. Think of this analogy: When you blow on your coffee to cool it down, your actual breath isn't what is cooling off the coffee. The heat from the coffee, heats up the surrounding air above the coffee, essentially trying to cool itslef down. What you are doing by blowing on it is displacing the hot air and moving in new air for the coffe to heat, therefore being able to give off more of its energy. You are right that there is a certain about to where the light will not require anymore air (CFMs) to cool down, but I would think that is a pretty high number. Plus it is not "bad", it is just excessive. It certainly won't decrease the heat transfer. Sorry, not trying to sound like I am biting your head off. Just trying to give all the readers a little heads up. Thanks for all of your input uncle

Crapon

knorecollection, Sorry I don't know of any Aussy distributers. I only know of a Canadian and an American.

www.growsystems.com

and

www.growgeek.com

Try contacting one of them and they might have some Manufacturer info

I am super stoke on the feedback from this thread. Can't wait to start my first Hydro grow

Cheers!

schoolteacher

I am interested in the humidity problem. Has anyone had a moisture problem around the bulb? What if the reflector were a little larger? I am setting up a 9 sq ft room with a 1000 watt light.
Before I read this thread I was planning on a setup very simular to plan number 2 thinking that I could use one powerful fan to cool the light and also vent the entire small room to perfection. I know I will have to vent the room vigerously to keep conditions ideal. Its been a while since I had a sucessful grow and I am determined to make this go around a great one. Got some apollo11

papadanknc420

CRAPON,
Any ideas for using a cheaper inline fan? I went to growgeeks website, and wow are they expensive. I love your light setup but need to do the cooling on a budget.
papa

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Always remember...BE kind and GROW kind!

Afghani/Skunk

Crapon

schoolteacher:

Ok, think of your problem like this. A lot of people don't have air cooled hoods, so the bulb is constantly in an environment with humidity and dirt, etc. So if you wanted to have one "big" fan, say a 636CFM 8inch fan sucking air through the light hood and out of your grow space, I would see no problem with that. It all depends. But you will need a pretty big (CFM) fan to ventilate a 9ft sq room and a 1000 watt light. remember, if your room is hot, your light will be trying to cool off with warm air. It is kinda hard to cool off with warm air, but as long as it is 80-85 degrees or less you should be chill... I kinda lost focus, so respond with any questions you might have. Btw a major struggle of mind for the first grow, was heat. It caused my plants to grow soooo slowly, but they eventually grew. That is why this time around, it is no big deal to spend a few hundred to properly ventilate my room and light.



papadanknc420:

Umm.. Well inline fans are genereally pretty expensive. Mainly because they are VERY quite, draw less than 1 amp, and move a sh*t load of air (yes, that is a technical term). Your options are slim, if you want to cool enclosed hoods. You could get two 172mm computer fans, if you can find them (caseetc.com), and have one at the beginning of the line and one at the end, but that is like $20 a fan, and you still need (2) 12v converters so you can plug em into the wall which cost $15 a piece. And quite frankly, that may or may not cut it. You can get a 152CFM hurrican 4inch fan from growsystems.com for $132 +shipping which is a friggin steal. Most shops sell those for over $200.

papa, I hate to say it, but it is better to spend the money now and reap the benefits later. If you are stingy on your equipment it makes it 10-fold harder to produce GOOD medicine. Most small setups including light, ventilation, grow space supplies, and growing device (a.k.a. soil or hydro) will run you from $400- 800 depending on the wattage of the (1) light you use and if you are doing soil or hydro... Except to spend the money, because it is definitely a great investment for the returns you get.

Hope that helped
cheers

schoolteacher

you think one of those 8" inline hurricane fans would do the trick?
I see 4" through 12" The 12" says 800cfm. but that thing to way to ****ing expensive. Also, would you try to run the intake of the light through some sort of filter? It seems that with all that air running through the reflector, I may need to just plan on cleaning it from time to time. The room that will be the intake for the small grow space will likley be around 75 to 80 much of the time, if that is the case do you think I should consider the biggest 800cfm fan. What would you think is a big enough fan to do what I am wanting? Thank you for your insight on this

Crapon

schoolteacher,

The deal is, you have a 9 sq ft room, which can handle heat a bit better than my 2x4.5 ft closet.

The rule of thumb is that you buy a fan that will replace the volume (cubic ft) of the grow room in 5mins or less. So besides that you are just trying to cool your light... right? If the fan gets its intake from the grow room, you still need intake fans for the grow room, so in most cases you are better off buying some computer case fans (120mm) and using those to intake and exhaust your grow room for proper air movement, then buying a hurrican or elicent fan that will cool your light.

depending on the height of your grow room, you will need 9 x 9 x 8(avg height) = 648 CF (cubic feet) of air movement through the room to be evacuated every five mins. so if you did 648/5= that would mean you would need 130CFM fan(s) to move the proper amount of air through the room.

SO, get yourself a 4 or 6inch fan, hook it up to your light, sucking air in from your grow space and exhausting out the room. Then buy a couple computer case fans adding up to *MORE* than the CFMs of the inline fan (could be anywhere from 2-5 depending on which inline fan you buy) and use those for intake for the grow room..

Conclusion, Sorry about spirting off soo much crazy ****, I am in a hurry. Uhhh.. now that I think about it, probably using intake from the grow room to cool the light is a bad idea. Just buy a 4inch inline fan for the light, then buy like 2-3 computer fans for intake to your grow room, and 2-3 for exhaust depending on what their rating is... That is probably the cheapest, and most efficient way. Keep the process of cooling your light and ventilation for the grow room seperate. Just remember for ventilation Cubic Feet of your grow space needs to be refreshed every five minutes which means cubic feet / 5 = CFMS of the intake fans, and CFMs of exhaust. If both intake and exhuast fans are rated differently, you will get a wierd pressure build up.. if anything, have more CFMs exhausting than intaking, but try to get it to be equal...

AHHHH!!!!!! I gotta run.. I think I confused myself with all that infor... but if you have any questions on that big jumble of sh*t up there, let me know

cheers