QAUNTUM BOARD vs HID heat difference

[ChiefRunningPhist]

For the visual learners ..

The HPS was 640W and the LED was 430W.

If 1 watt = 1 watt of thermal, then the HPS shouldn't be doubling the LED, it should only have a 50% greater rate.



Dotted red line is what its supposed to be if 1w= 1w of heat. Pink is measured LED function, and Black is measured HPS function.

 

[sethimus]

For the visual learners ..

The HPS was 640W and the LED was 430W.

If 1 watt = 1 watt of thermal, then the HPS shouldn't be doubling the LED, it should only have a 50% greater rate.

View attachment 4379265

Dotted red line is what its supposed to be if 1w= 1w of heat. Pink is measured LED function, and Black is measured HPS function.

if you have 2 complete insulated rooms and you hang in one room 1000w of HPS and in the other 1000w of leds, what will the temperature be inside after say one week of running full time? same or not?

 

[hillbill]

Ball of confusion reforming in my head.

 

[ChiefRunningPhist]

if you have 2 complete insulated rooms and you hang in one room 1000w of HPS and in the other 1000w of leds, what will the temperature be inside after say one week of running full time? same or not?

Yes same.

 

[sethimus]

/thread

 

[ChiefRunningPhist]

All energy eventually dissipates to thermal, well, irl at least, but idealy you could have an oscillating kinetic energy that would osscilate forever or a light that could reflect forever, ect. But irl ya, it all gets transformed into thermal eventually.

 

[Therrion]

All energy eventually dissipates to thermal, well, irl at least, but idealy you could have an oscillating kinetic energy that would osscilate forever or a light that could reflect forever, ect. But irl ya, it all gets transformed into thermal eventually.

I replaced my 2x 1000w DE HPS watt for watt with 24 chilled logic pucks. It feels so much cooler, that's what I can't wrap my head around.

 

[growingforfun]

Yes same.

So here you say 1kw hps will be the same temp as 1kw led. That's means a watt is a watt heat wise. Ughh..

 

[ChiefRunningPhist]

So here you say 1kw hps will be the same temp as 1kw led. That's means a watt is a watt heat wise. Ughh..

Cmon man, I dont think you tyvek your plants in your grow room? You make sure no air escapes, and plug every exhaust, right? That's what you do? Lol, jks, but the rates that we exhaust and the rates that the tent or grow room conducts all plays a part. If we used insulated rooms where no energy escaped, after a few hrs your plants would be toast, probably much sooner, but we don't have these types of tents and we purposefully exhaust. How much enegy we add to the air, or the rate that we add energy to the air will determine our exhaust rate, but if you have the same exhaust fan but different efficiency lights, then 1 light is giving more energy to the air than the other. The energy that the tent absorbs is 5x as much as the air per °C, and is in contact with the outside air. If it heats up it will convect it's energy to the air as well, but much more uniformly and less impactful per time compared to the light fixture, due to the temp difference. If your tent is 81° and the air is 80° it's going to slowly add its energy to the air and the air can't get higher than 81°. If your fixture is 150° and the air is 80° then the air can reach 150°, and the thermal is flowing much quicker at that gradient.

 

[ChiefRunningPhist]

1 watt = 1 Joule per second. It's a rate. We measure our energy consumed with a rate.

Joules are units of energy. Energy can be in all sorts of forms. It's not just thermal or heat, the energy eventually dissipates to thermal, but it could have been chemical initially (battery), and then it transforms into electrical, then possibly to kinetic (turn a fan prop), and as the friction of the fan is present a portion of the kinetic gets stolen and dissipated as thermal (heat)or electromagnetic via IR (radiant heat). In each different phase it will have different effect on ambient air or air temp. The battery doesn't give any of its energy to the air (very little) so despite there being energy present, there is no change to air temp, and then following it through its process again we see that finally as it gets converted into kinetic we begin to effect the air temp due to the tiny bit of friction that uses up some of the kinetic for thermal.

 

[growingforfun]

It sounds to me like you said that a watt is a watt and 1kw of hps will heat as much as 1kw of led, unless you grow in a tent, and unless these other factors.

Well I dont grow in a tent. And I vent into a second area that's opens back to my main room on the far side. It isnt sealed, but it also in no way resembles your made up scenario.

It seems dishonest to me to claim they are totally differant, then admit they are the same, but they are differant if these factors are in play that you assume everyone follows.
I run 24hr veg, theres no downtime. Claiming they heat at differant rates but average to the same over a given time makes zero dofferance if true at all.

 

[Norml56]

This is my first grow. I work on a drilling rig. I left home 14 days ago for work and dont get home for another 20 or so.
My wifes looking after things. The QB and the CMH didnt arrive till i was at work. The QB just arrived today. She hasnt hung it up yet. She just put the cmh up 3 days ago

I paid 350 canadian for a 315watt sunsystem CMH with a Phillip's 4100k bulb.
That's roughly 290 usd

I asked because I needed an answer. If I already knew the answer why would I ask?
Noone says you have to answer the question..I just asked to get a better idea what.might be dealing with to take a bit ofthe work load off my dear wife while I'm away.

To be fair none of that information was given. You stated you were looking to replace the 600watt HPS which generally means it wouldn't be your first grow. You generally don't buy equipment never use it and then buy more equpiment to replace it. I apologize as I mis-read your post on the cost of the CMH I thought it read you paid 580.

 

[PSUAGRO.]

Oh look, another one of these threads.......fun

 

[ChiefRunningPhist]

It sounds to me like you said that a watt is a watt and 1kw of hps will heat as much as 1kw of led, unless you grow in a tent, and unless these other factors.

Well I dont grow in a tent. And I vent into a second area that's opens back to my main room on the far side. It isnt sealed, but it also in no way resembles your made up scenario.

It seems dishonest to me to claim they are totally differant, then admit they are the same, but they are differant if these factors are in play that you assume everyone follows.
I run 24hr veg, theres no downtime. Claiming they heat at differant rates but average to the same over a given time makes zero dofferance if true at all.

I'm pretty sure your the only one that doesn't get it. Its all there, just give it a quick once over.

 

[growingforfun]

I'm pretty sure your the only one that doesn't get it. Its all there, just give it a quick once over.

Guess I just dont see it the same way you do. Sorry bud, a watt is still a watt to me.

 

[1212ham]

Oh look, another one of these threads.......fun

Yeah, but Chief added or explained some info I hadn't considered.

l'll just add this... It's true that plants absorb SOME of the energy, but I think not much.
I look at it this way, how many kilowatt hours can a plant can store? Green energy!

 

[newguy41410]

ChiefRunningPhist,
What is your opinion of sealed rooms running HPS? I notice you mentioned that growers should be exhausting the heat but am not sure if you are implying that growers should not be in sealed rooms with a large amount of heat? For example, my roommates and I were thinking about running 5 or 6 DE 1k lights in a sealed room. We would need 24k BTU of cooling power obviously but am not sure if it should be sealed so that we can take advantage of CO2, or have some type of exhaust set up?

 

[Chip Green]

How much will the heat be reduced, by defoliating a plant, immediately after flushing?

 

[PadawanWarrior]

How much will the heat be reduced, by defoliating a plant, immediately after flushing?

I'm my experience the more plant matter in the room, the cooler it stays. When I chop one of my plants down my grow room temp rises. I was guessing it might be because less plants or plant matter means less transpiration.

 

[ChiefRunningPhist]

ChiefRunningPhist,
What is your opinion of sealed rooms running HPS? I notice you mentioned that growers should be exhausting the heat but am not sure if you are implying that growers should not be in sealed rooms with a large amount of heat? For example, my roommates and I were thinking about running 5 or 6 DE 1k lights in a sealed room. We would need 24k BTU of cooling power obviously but am not sure if it should be sealed so that we can take advantage of CO2, or have some type of exhaust set up?

I'd use cool tubes. I'd have the intake and exhaust open to the outside, but isolated from grow area. This way you won't be effecting your CO2 concentration because of your heat mgmt. Then Id use another exhaust line for my grow room air mgmt. If possible Id try to mount ballasts outside grow, but my ballast cords were always pretty short. You can lengthen the cord but you'd maybe want to increase wire gauge if you did.

If the room is well insulated youll need an AC but with this way you're not relying on the AC so much you can drop your energy costs. If you're trying to maintain CO2, then obvi you'd rely more on your AC then your aux exhaust line, but you could tune to your liking.

@Renfro has some good experience with high wattage HID grows, he might have something to add here.