led vs cfl vs hps/mh??
- Thread starter thamadfarmer31
- Start date
bicit
Well-Known Member
Yes and no. They don't actually run any cooler, they actually produce about the same amount of heat when compared watt-to-watt. The advantage is that most of the heat is directed upwards into the heatsink and dispersed instead of being cast in all directions including towards the canopy. They reduce canopy temps rather than ambient temps in my experience.
hyroot
Well-Known Member
It depends on the drivers and leds and fans and heat sink. 2 different panels of same wattage can put out a different amount of heat. 3 460 watt inda gro's puts out less heat than 2 432 watt 8 bulb T5's. 330 watt cmh puts out the same heat as a 250 watt hps. 860 watt cmh puts out the same heat as a 600 watt hps. It all depends on the materials the light is made from, not necessarily the watts. This subject has been done to death like defoliation has.
hyroot
Well-Known Member
I didn't think of that one. That might be why hps plants have such a high metabolism rate I guess
hyroot
Well-Known Member
For every 10 degrees of IR that is increased at leaf surface, it doubles the metabolism rate
Yodaweed
Well-Known Member
Some LEDs use IR diodes , here's my LED complete with IR diodes, UV-B bulb and low heat signature! Sure hotter than my A51 SGS160 but also makes kickass buds of epic quality 
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Rrog
Well-Known Member
... I'd have to see a reference, man. No offense intended brother. IF 10 degrees of IR = 10 degrees of heat, F or C, it's heat. So adding even 10F from 70 to 80F would double the plant metabolism? 80 to 90F?
Am I mis-understanding?
bicit
Well-Known Member
I was speaking more in general than specific examples, I guess I was a little overly vague. I'm thinking more from a conservation of energy perspective. When comparing two sources of light of equal efficiencies they're going to produce about the same amount of heat energy and raise the ambient temperatures of the room about the same amount assuming there is no mechanical means of removal(ventilation, ect) and the drivers/ballast is located externally.
From my experiments high end COBS(cree/bridgelux) raise the temperature of the room about 10% less than an HID of equivalent power displacement in sealed conditions and external drivers/ballasts. What makes LED's so much nicer is that photon delivery is much more efficient along a two dimensional plane so it doesn't require as much power displacement to reach an equivalent level of canopy illuminance.
YMMV of course.
Could you expand on this a bit? I don't understand what you mean by '10 degrees of IR'.... It sounds interesting though.
hyroot
Well-Known Member
gg posted a something from University of Utah on the subject a while ago. l may have to dig for a little bit.
PSUAGRO.
Well-Known Member
You don't wanna start this WATT debate again especially with hyroot involved
........you are absolutely correct though.Toaster oven analogy incoming!......... good times;lol
Doubling metabolic rates through higher temps (ir included) without increasing your co2 levels=== not gonna happen
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Yodaweed
Well-Known Member
I feel like your experiments might be a great info source but also think different makes of LED fixtures will give different heat , I .E. Lower pushed diodes on a larger heatsink with good large fans blowing actively across the heat sink will cool a LED much better than a thin Heatsink, no fans on the heatsink(passive cooling) , pushing diodes too hard, and quality of the metal you use for a heat sink.
Yodaweed
Well-Known Member
Copper and titanium are much better at spreading heat than steel or aluminum. I noticed a lot of real high quality heat sinks use copper, and I use a titanium nail on my dab rig I bet if you could afford to make a heat sink out of it ,then it would be badass. Here's a light I have's Heatsink specs:
Heatsink Design
Each ION8 module is made with a real solid core copper heatsink. Copper is much more expensive than traditional aluminum but it also conducts heat better, no cost is spared for top quality performance.
The heatsinks used in the ION 8 are made for today’s high performance CPU’s which produce a ton of heat. They easily disperse more heat than any previous LED heat sink and allow for a significantly lower operating temperature. The lower operating temperature leads to longer life and happier customers.
Heatsink Design
The heatsinks used in the ION 8 are made for today’s high performance CPU’s which produce a ton of heat. They easily disperse more heat than any previous LED heat sink and allow for a significantly lower operating temperature. The lower operating temperature leads to longer life and happier customers.