The Reason Why LEDs Need A Heat Sink - Electricians Q&A

[@efixx]

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[@MickeyMolad]

I had always wondered why lower wattage LEDs needed heat management while bulbs at 60+ watts did not!

[@guffermeister]

Tungsten fillaments can handle several hundred deg C. An LED can't....

[@TheEulerID]

The reason is the requirements are polar opposites. Ordinary tungsten light bulbs work because the filament is heated to white hot. They simply wouldn't work if something conducted away all the heat and traditional light fittings are explicitly designed not to conduct heat away efficiently. The incandescent bulb needs that heat to work as that is how the light is produced. However, LEDs don't work like that. They generate light by electrons jumping a band gap in a semiconductor (typically around 3V depending on the LED colour). That produces photons of light directly and not only doesn't need heat to do it, but above a certain temperature, it will actually damage the semiconductor material. LEDs are more efficient than incandescent light bulbs, but they still produce waste heat, and that has to be conducted away or the device will fail. So an LED fitting has to be cooled, when it's the last thing you want with an incandescent light fitting. The former dislikes heat, the latter won't work without a lot of it. It also follows, of course, that fittings designed for incandescent lamps are not ideal for LEDs and vice-versa.

[@hmouday9446]

What is the best way to dim a group of LEDs remotely in a big industrial area ?

[@carlosjackal7624]

Ive only ever fitted colour changing spots .the low bays ive fitted led werent even colour changing.that was 3 year ago could be something on the market now

[@arcadia1701e]

Buy high bays that have 50% dimming low voltage controller.

[@jameschamberlain6266]

Lighting Control Modules, Kliks

[@hmouday9446]

Thanks for the replies, I’ve a false ceiling fitted lights in my workplace and searching for a dimming controller

[@ShadowzGSD]

does not help that they overpower the leds, they cook the poor things, would last a lot longer if they put in more leds to get the same output and would generate a lot less heat.

[@waynio67]

Search for Dubai lamps for this point

[@efixx]

Watch this space

[@ShadowzGSD]

@@waynio67 no point, i know what they are.

[@ShadowzGSD]

@@efixx 👾👾👾

[@PhlegmBrulee]

LED lighting’s great except for the designs that flicker, especially dimmable lighting at low brightness. Also the reduction in colour rendering which has largely stagnated in the range of 80-90 CRI.

[@dbonyad]

LEDs actually do give out heat in the form of infrared. All hot bodies do.

[@stephensnell5707]

In truth L.E.D. Lights will get a bit warm but nothing compared to earlier type lighting which is why L E.D. Lights are way more efficient

[@alunroberts1439]

I hear that incandescent wast energy with heat. So led lamps also have heat issues so is that also wasted energy. A shop I did work for changing all 20 of his old style tube lights he did save money over the summer but he did say the shop is so much colder in winter an ended up over the year paying more having heating on. So my point is is that heat out put with light us killing two birds with one stone. Can the heat out put that is heating the shop help reduce cost of normal heating. So there good and bad. Back when I was at college back in the late 80s we did led light panels. Were we had them in strips switching on and off very quick so to the eye the hole panel was on this was to safe power. Were will lighting be in 5 years. Could we not plumb them in to the water have water cool the housing an use the heat to reduce cost. Sounds mad a mental idea but some of the best things we have started as a joke. Dam Were are my royaltys.

[@odinnln5694]

Heat output from an LED is around 20% while heat output from an incandescant lamp is around 80%.

[@guffermeister]

So fluroescent are somewhere between incadescent and LED in terms of efficiency. Have to also remember the location of the light fittings - in a ceiling not necessarily very efficient when you want the heat lower down in a room/building. There is heat generated by a light source, but an electric convector heater is 100% efficient, whereas a light source isn't - part of that loss of "efficiency" is light so still more efficient to use LED bulbs and a separate heating source

[@alunroberts1439]

@@guffermeister My thinking was in winter he was much wormer he did not uses as much money on heating then changed all the lighting his cost did go up. But in summer he has too much heat. My TV is a old bit good plasma it has heat out put but in winter I like it. I was going to try and work out light out put heat out put an see costing. Some people don't like LED lights as there to white incandescent have a wider bandwidth of light that is like sun light that humans like. List all the good list all the bad. My head will hurt trying to work it all out. As I see it if lights give heat wasted energy if LED light need heatsinks bad design also wasted energy. But is heat out put as well a bad thing going back to winter time.

[@childishtombino1275]

@@alunroberts1439 It's definitely a valid point. I'd argue that in bigger buildings or places outside will be fine with LEDs. Especially outdoors.

[@manganiphiri4331]

Remember seeing a video of something similar. The icing of traffic led lights in colder countries when they switched to efficient led type traffic lamps. Sometimes you have to look at the two sides to every story. Interesting scenario and would have loved to look at the actual measurable data on your project so to speak.

[@hond654]

Because cheap capacitors will die after a year over 85C if they are part of the assembly.

[@guffermeister]

Or in cheaper fittings cheaper LED's with a much lower lifetime and also possibly over driven

[@waynio67]

I’d feel a lot better about LED’s if they wasn’t so over driven by the manufacture’s so they prematurely fail,

[@calmeilles]

Absolutely. Big Clive frequently shows mods that slightly reduce the driving current for hugely improved lifespan. Then there are these efficient and super-long life bulbs developed for Dubai that we're not allowed to have. kzbin.info/www/bejne/oZ3Ee6Slm6imq5Y

[@waynio67]

Yeah he’s good isn’t he