lights that are cooled?? HOW.........

[That 5hit]

before i spend a lot of cash

is air cool just the same as liquid cool, cant they get close also, and with air cool do you push ac air around the bulb or just fanned air, and in all cases how much closer can they get

light............................................. distant
600w not cooled............................?????
fan aircooled .................................?????
a/c aircooled..................................?????
water cooled..................................?????

fillin what you know
can anyone tell me the numbers. (it does not have to be a 600w'er what ever you have info on)

and if you could answer in the above formate +rep

 

[Cr8z13]

Air and liquid cooled are two very different things. Air cooled, an extraction fan is used to draw hot air away from the bulb. Water cooled, is just that. Water is circulated around the bulb to remove heat. You need a large reservoir for the water as well as a chiller to cool the water. This is much more expensive than air cooled, which is probably the way to go in most cases.

I first started growing without an air cooled hood and I had major heat issues. Since I started using the Cool Tube those problems are mostly gone as long as the ambient room temp is under 80 degrees. My grow space usually runs a few degrees hotter than the ambient temp. My goal is to keep it under 85, which would have been impossible without the Cool Tube. I can place the light eight inches away from my plants. Before the Cool Tube it was more like 18" because the bulb was so hot.

 

[That 5hit]

what size light r u useing, and is it just a fan pulling away hot air and is the light inclosed

 

[LiquidLumen]

Ok, here's a scientific answer for a comparison of liquid vs air cooling, if you're familiar at all with thermodynamics this should make sense:

Let's assume a few things.

1) Let's start with a 600W light- and we'll assume it's 50% efficient (it doesn't matter how accurate that is for this argument) and we run it for 10 minutes. 1Watt = 1Joule/second. Let's choose a time period of 10 minutes. Let's also assume for comparison's sake that the water and air are both at 25C.

Ok, with our basis of 10 minutes, we are working with 3000J of energy to dissipate. With that, we can now compare the abilities of air vs liquid:

The volumetric heat capacity of air at 25C = 0.001297 J/cm3 C
The volumetric heat capacity of water at 25C = 4.186 J/cm3 C

From these two heat capacities, it should be immediately clear that water is able to absorb MUCH more energy per unit volume than air. But let's continue just to get a better idea of exactly how much more effective it is:

Let's assume we want to lower the temperature by 5 degrees from some initial starting temperature, and then we can calculate the volume of air vs the volume of liquid to achieve this temperature drop.

Air:
cm3 = 3000J/[(.001297J/cm3 C)*5C] = 462 606 cm3
Water: 3000J/[(4.186J/cm3 C)*5C] = 143 cm3

As you can see, liquid cooling is much more efficient- you would need over 3000 times the volume of air per unit time to achieve the same cooling effects as liquid water. This is why liquid cooling is used in cars (radiators), high performance computers, and many other industiral/commerical applications.

 

[That 5hit]

i gonig tobe frank right now i started to read that and my nose started to bleed. it stoped once i read this part


you would need over 3000 times the volume of air per unit time to achieve the same cooling effects as liquid water. This is why liquid cooling is used in cars (radiators), high performance computers, and many other industiral/commerical applications.

thanks for all the info, now i will wait for the rebuttle, im sure the fan cooled guys are going to weight in ihope that they are as tec, as you where .................


one more question for you watercooled guys is there not a clear coolent Liquid that could replace the whole need for a water chiller like engine coolent but clear

 

[somEGuy1]

well the most popular`air cooled lights are fans...ac is pretty expensive. there are tubes running from one end of the light to the other....one end the fan the other the ventilation...

you still need to keep the light pretty much the same distance from the plants but it cools the room down a lot.

600w not cooled......2 ft from plant(room 85 degrees)
600w cooled............2 ft from plant(room 75 degrees)
ac air cooled............1.2 ft from plant(room 70 degrees)

ballpark estimate

 

[AquafinaOrbit]

Most water cooled setups, at least that I have seen have the water running directly over the bulb or glass. Now that matters because light does not penetrate water at a 100% rate and you will be using if I remember correctly something like 20% lumens. Also though water can hold more heat then air, it also transfers it slower. A decent setup could be made though using a radiator from say a bronco.

 

[Cr8z13]

what size light r u useing, and is it just a fan pulling away hot air and is the light inclosed

I use a 600W light. This is a Cool Tube:
http://www.horticulturesource.com/product_info.php?products_id=6213

I then use a fan similar to this one:
http://www.horticulturesource.com/product_info.php?products_id=1544

I'm using a grow tent so I have the fan placed outside of the tent and it sucks all the hot air away from the Cool Tube and I vent the heat into the attic.

 

[tip top toker]

watercooling lights is just daft in my opinion, unless you know EXACTLY what you're doing, you're just assking for trouble.

i use a cooltube, and an inline fan, it works just dandy.

 

[That 5hit]

watercooling lights is just daft in my opinion, unless you know EXACTLY what you're doing, you're just assking for trouble.

i use a cooltube, and an inline fan, it works just dandy.

give more testimony tell us the dif. from haveing and not haveing
what size light and how much closer can you get

 

[That 5hit]

so, air cool is just to help lower the room temp while water cooled can help lower both bulb and room temp...am i right ???

 

[tip top toker]

i'm just using a 400w hps with a cooltube, i can have it say 3" from the tips without heat issues arising. cab stays at 80.

lowering the room temperature is partly just a by product of how the aircooled lights work, the air travelling across and around the bulb will cool it, wind chill factor blah blah, in the same way if you turn the fan off on your computers cpu heatsink, it'll end up overheating. the air draws the heat away from the bulb and replaces it with cool air.

 

[That 5hit]

so if you had a fan blowing air on the bulb, as well as the fan pulling air from the bulb, would this work twice as good

 

[jeebuscheebus]

Air is easier to move than water in terms of volume. That 3000 times volume is some fuzzy math.

In a perfect world, a water cooled system could be awsome. Most folks don't have the time, money or space for liquid.

Enclosed hood with intake and exhaust seperate from the room is key. Move enough air and the heat goes bye bye.

 

[That 5hit]

so if you had a fan blowing air on the bulb, as well as the fan pulling air from the bulb, would this work twice as good as just one fan pulling

 

[cflMAN]

look at the video,my local ''candy shop'' a bit http://infiniteseason.com/store/more costly,but worth it.but till mine r delivered,my 400w, is 8in'' from topps,with window a/c set at 70,witch keeps the light at 77

 

[doc111]

give more testimony tell us the dif. from haveing and not haveing
what size light and how much closer can you get

I have an aircooled reflector with a 1000w switchable ballast. I didn't hook up the fan when I got it so I could compare how well it worked. It got over 95 degrees in my flowering room. When I hooked up the duct work and fan it stays about 78-80 degrees. Big difference. Also I can keep the light about 12 inches from the top of my plants with no ill effects. Totally worth the money IMO.

 

[That 5hit]

 

[doc111]

so if you had a fan blowing air on the bulb, as well as the fan pulling air from the bulb, would this work twice as good

Not really necessary. I have a fan blowing air over the bulb. I can set my hand on top of the reflector and it is cool as a cucumber.

 

[That 5hit]

Not really necessary. I have a fan blowing air over the bulb. I can set my hand on top of the reflector and it is cool as a cucumber.

what size bulb do you have
and is the fan just blowing over the bulb or is it pulling air