# Fact or Fiction - LEDs dont produce heat

We report, you decide.
http://www.ledsmagazine.com/articles/2005/05/fact-or-fiction-leds-don-t-produce-heat.html
https://en.wikipedia.org/wiki/Thermal_management_of_high-power_LEDs
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Ok, So it seems that LEDS waste about 70% of the energy that they consume and that energy becomes heat.
Unless they are IR LEDs
In so much that the typical LED, and all of the ones I have purchased, use 10% or much less energy than a comparable incandescent light I have not witnessed any heat at all. My sampling has included 3-4 ribbons of LEDs, multiple strings of LED Christmas lights all plugged into each other, and a couple of out door 60 watt incandescent coach lights replaced with equivalency light out put LED bulbs. The biggest consumers of electricity of this sampling is 7 watts and even those might only be producing about 1/3 the amount of heat of a typical 7 watt incandescent light bulb.
Show me a single LED that consumed 180 watts by itself and I think it, the LED itself and not the transformer or other involved electronics, will get hot enough to equal a common 60 watt incandescent light bulb.
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You will need more sensitve equipment than your fingers to actually measure the heat produced. If you wanted to argue about it someone could, but not me.
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On 5/9/2016 6:50 AM, Markem wrote:

Well, I just checked an 60 W equivalent LED in the kitchen and it gets warm around the base. However, when I found a 60 W incandescent it didn't take but about a minute to get too hot to touch. Checking the card a replacement in the drawer is on it says that the 60 W equivalent LED uses 9.5 W. So the answer to the original question, whether LEDs produce heat, is yes. But they produce much less heat than incandescents. I don't expect that a small LED would produce enough heat to be easily detectable by hand.
Bill
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On 5/9/2016 6:50 AM, Markem wrote:

LOL.. which is why I mentioned that If my fingers feel no heat at all there for the most part the LEDs that I have used produce no appreciable heat.
I measure heat this way. I feel nothing, I feel a little warmth, I feel something hot that I don't want to touch.
The 7 watt single bulbs get a little warm where the ballast/transformer is located near the screw in base but the bulb itself only gets warm when the sun shines on it. I leave these lights on 24/7 also.
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Well, I can tell you a 60 watt LED array produces enough (radiant) heat that you can feel it 5 feet away. (LED aircraft landing / taxi lighting). 10 WATTS PRODUCES ABOUT 30000 CANDELLA AND 1000 LUMENS.
So imagine 60 watts!!!!!!!
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On 5/9/2016 10:24 AM, snipped-for-privacy@snyder.on.ca wrote:

I have got to imagine voltage plays a large part. My 16' string uses about 48 watts, 12 volt to light up over 500 3528 LEDs. No heat when off the real.
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The worst LED bulbs I have used were the C9 replacement for night lights. It melted the plastic fixture, so they went in file 13.
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100 watt LED gets VERY hot, very quickly.

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On 5/9/2016 7:43 AM, Spalted Walt wrote:

Well even a blind hog.....LOL
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On Monday, May 9, 2016 at 9:42:06 AM UTC-4, Leon wrote:

I think a detailed spreadsheet is in order...any volunteers? :)
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Another 100W LED 'blind hog' dealing with the heat:

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On 5/9/2016 10:32 AM, Spalted Walt wrote:

Understood but none of the mega LEDs are anywhere near a home lighting fixture.
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I agree 100%.

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On 5/9/2016 7:43 AM, Spalted Walt wrote:

So does a 60 watt incandescent blub. LEDs with equivalent light output of common home incandescent lights do not.

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Not surprising considering an A19 60W equiv LED consumes 8 - 9.5W and produces no IR.
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Exploding LED lights

When bread boarding LED's I have burnt my fingers more than once on an over driven LED, the bulbs can take more than the ribbon stuff does.
Just thought I'd throw this into the conversation.
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On Mon, 09 May 2016 10:34:46 +0000

they produce heat
will they get to 451 farenheit is what wood workers wanna know
what do the data sheets say at digikey
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http://www.cree.com/led-components-and-modules/products/xlamp/discrete-directional/~/media/Files/Cree/LED%20Components%20and%20Modules/XLamp/Data%20and%20Binning/XLampXML2.pdf
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On Mon, 9 May 2016 11:20:27 -0700, Electric Comet

No, but they don't have to get even close to that hot, to burn your house down.

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