Air cooled lights....

Kingrow1

Kingrow1

Well-Known Member
MichiganMedGrower said:
Well your lazer analogy has little to do with light bulb reflectors but I said I read the 50% thing.

i still know I can't cool my 2 reflectors open without glass with the same fans I use with them sealed and air cooled. And I am just exhausting my room through them. They aren't even isolated.

I also can't get them as close to the plants without stress open without glass. Further proving they are cooler behind fan cooled glass.

And glass does cut a bunch of uv and ir and along with it radiant heat.

So I guess I disagree with your premise from my own testing and research.

I have to stop air cooling through the lamps in winter just to keep room heat up. Just running fans on low is not enough without disconnecting the ducts to the lamps. Doesn't that prove they are cooler in sealed air cooled fixtures?

The radiant heat and the heat from the lamps are continually removed immediately from the source.

It works so well lamps that rely on temp for their output like de hps shouldn't be air cooled. It lowers their temp too much to work properly.

The more I think about it the more evidence there is that they run much cooler.
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Fair enough but i feel the radiant heat removed by the thin glass is barely but a fraction of the radiant heat contained within the lights, my lazy analogy was more an attempt to keep it simple, there are scientific principles that give hard math answers, i did a lot of the maths in rough and came to this conclusion as well as from studies on light and leaf surface temperature. Here is a link to visable light as a heat source (obviously we know of lasers already) -

https://en.wikipedia.org/wiki/Thermal_radiation
 
SPLFreak808

SPLFreak808

Well-Known Member
The air that blows out my hood vent was hot enough to warm my home to 85F at 3am lol, i would wake up in sweat even though i leave all my windows open.

i will never vent the hood into my home again atleast not in my location, you could warm a california home during winter with that i would think.
 
Kingrow1

Kingrow1

Well-Known Member
SPLFreak808 said:
The air that blows out my hood vent was hot enough to warm my home to 85F at 3am lol, i would wake up in sweat even though i leave all my windows open.

i will never vent the hood into my home again atleast not in my location, you could warm a california home during winter with that i would think.
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I get a couple degrees above ambient at best but its a small grow and thats if i seal the room. Is this merely the convective heat though and its accumulation over time not the radiant light heat though?

Im not super clued up on it either, i only ask as i dont completely know.

Our breathing heats a room, energy lost from our bodies transfered as conduction then convection i think, we dont heat the room up much with our bodies through radiant heat.
 
Kingrow1

Kingrow1

Well-Known Member
I feel a lot of intrest into cmh, didnt the new ballast sort the uv problem or do you still need one of those bulb cover uv filters they use to sell.

Again im not super clued up on cmh.
 
MichiganMedGrower

MichiganMedGrower

Well-Known Member
SPLFreak808 said:
The air that blows out my hood vent was hot enough to warm my home to 85F at 3am lol, i would wake up in sweat even though i leave all my windows open.

i will never vent the hood into my home again atleast not in my location, you could warm a california home during winter with that i would think.
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I warm my Michigan home supplementally with my filtered grownroom exhaust. Saves a whole tank of propane each year. About 425 gallons.

I run it out the chimney in summer. Under the living room in winter.
 
SPLFreak808

SPLFreak808

Well-Known Member
Kingrow1 said:
I get a couple degrees above ambient at best but its a small grow and thats if i seal the room. Is this merely the convective heat though and its accumulation over time not the radiant light heat though?

Im not super clued up on it either, i only ask as i dont completely know.

Our breathing heats a room, energy lost from our bodies transfered as conduction then convection i think, we dont heat the room up much with our bodies through radiant heat.
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Yes from convection, who & oldmed pretty much laid it out.

Energy can only be transfered, thermal energy from the bulb to the grow room is the last place you want it lol, thats probably a good thing that it doesn't make no difference for you. You could have some efficient thermal conductivity without even knowing it.

Some of those bulbs can burn up to 900F+, if you are already battling heat then a sealed hood does help.
 
SPLFreak808

SPLFreak808

Well-Known Member
MichiganMedGrower said:
I warm my Michigan home supplementally with my filtered grownroom exhaust. Saves a whole tank of propane each year. About 425 gallons.

I run it out the chimney in summer. Under the living room in winter.
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That's pretty damn good, see thats what im saying lol.

I know its hot because the last position i had mine was near the drier vent outside, i remember comparing the heat from both and it was hard to tell the difference.
 
Kingrow1

Kingrow1

Well-Known Member
SPLFreak808 said:
Yes from convection, who & oldmed pretty much laid it out.

Energy can only be transfered, thermal energy from the bulb to the grow room is the last place you want it lol, thats probably a good thing that it doesn't make no difference for you. You could have some efficient thermal conductivity without even knowing it.

Some of those bulbs can burn up to 900F+, if you are already battling heat then a sealed hood does help.
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600watt in a 4x4 ait giving me much heat from my exhaust, it varies as i vary the speed control.

The same heat i get with no cool tube and just varying the exhaust speed control for the tent.

Energy is not lost or gained only transfered, the transference of light to the leaf surface carries all the radient heat energy of the par spectrum and neither glass or air filters out one without the other.

Both ligh and heat obey the same inverse square law, reduce light and you also reduce heat.
 
R

resinousflowers420

Well-Known Member
the reduction in heat using aircooled hoods should be atleast 5c,so its not always a massive amount,but its enough to make a difference.
also its not just about cooling the bulb,its about cooling the metal relector.
and you cant overlook some aircooled reflectors are better than others,and the power of your exaust fan makes a difference,and the temperature of the air coming into your tent.
that's why some growers like aircooled lights more than other growers,because setups are different.
 
Dr. Who

Dr. Who

Well-Known Member
Kingrow1 said:
The actual air cooled lights do not block any radiant heat, there fore whether bare bulb or air cooled the thermal emission is the same.

What are your lights cooling then?
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I'm not worried about radiant heat, I use it.

Hooded light fixture - closed space - light on, heats the air in that space - The air is now pulled from the space with cool air coming in. Air is now cooler, bulb runs cooler - thus lives longer. Less heat is coming off the reflector, meaning. Less heat is now being distributed in the out side-the-hood area. Thus, you have to cool less.

If I do not use the hoods or turn on the air from the hoods. The heat builds mighty fast and the AC cost goes up about $315 more a month.

I say that that $315 decrease is tangible proof of measurable cooling from hooded light fixtures!

Square inverse law be damned :mrgreen:
 
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