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Why do LEDs generate heat?

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Commander Kinsey
Guest

Thu Oct 03, 2019 2:45 pm   



Why do LEDs generate heat? I want a technical answer not "because they're inefficient". And will we ever make them more efficient?

Commander Kinsey
Guest

Thu Oct 03, 2019 3:45 pm   



On Thu, 03 Oct 2019 14:29:30 +0100, Commander Kinsey <CFKinsey_at_military.org.jp> wrote:

> Why do LEDs generate heat? I want a technical answer not "because they're inefficient". And will we ever make them more efficient?

I got useful answers from Quora:

"LEDs are ever more and more efficient. In the last 40 years, tremendous strides have been made. They generate heat because they are conducting electricity through semiconductors. Unlike metals which have very little resistance to electric currents, semiconductors offer more resistance. Not as much as true nonmetals, but still more than metals. It is the resistance of the semiconductor layers, both N and P, and the resistance of the junction itself, that generate the heat."

"Every electronic device is less than 100 percent efficient. On a low level, it is due to the law of probability, or as the physicists call it, entropy. The odds of all those electrons conveying their energy into photons is very low. Some are always making random transitions, generating heat instead of light."

Peeler
Guest

Thu Oct 03, 2019 4:45 pm   



On Thu, 03 Oct 2019 14:29:30 +0100, Birdbrain Macaw (aka "Commander Kinsey",
"James Wilkinson", "Steven Wanker","Bruce Farquar", "Fred Johnson, etc.),
the pathological resident idiot and attention whore of all the uk ngs,
blathered again:

<FLUSH the abnormal sociopathic attention whore's latest idiotic
attention-baiting bullshit unread again>

So you HAD to crosspost your newest bait to FOUR different groups again,
just so you could get all the more attention, you attention-starved,
sociopathic wanker!

--
damduck-egg_at_yahoo.co.uk about Birdbrain Macaw's (now "James Wilkinson" LOL)
trolling:
"He is a well known attention seeking troll and every reply you
make feeds him.
Starts many threads most of which die quick as on the UK groups anyone
with sense Kill filed him ages ago which is why he now cross posts to
the US groups for a new audience.
This thread was unusual in that it derived and continued without him
to a large extent and his silly questioning is an attempt to get
noticed again."
MID: <be195d5jh0hktj054mvfu7ef9ap854mjdb_at_4ax.com>

--
ItsJoanNotJoann addressing Birdbrain Macaw's (now "James Wilkinson" LOL):
"You're an annoying troll and I'm done with you and your
stupidity."
MID: <e39a6a7f-9677-4e78-a866-0590fe5bbc38_at_googlegroups.com>

--
AndyW addressing Birdbrain:
"Troll or idiot?...
You have been presented with a viewpoint with information, reasoning,
historical cases, citations and references to back it up and wilfully
ignore all going back to your idea which has no supporting information."
MID: <KaToA.263621$g93.262397_at_fx10.am4>

--
Phil Lee adressing Birdbrain Macaw:
"You are too stupid to be wasting oxygen."
MID: <uv2u4clurscpat3g29l7aksbohsassufe2_at_4ax.com>

--
Phil Lee describing Birdbrain Macaw:
"I've never seen such misplaced pride in being a fucking moronic motorist."
MID: <j7fb6ct83igfd1g99rmu4gh9vf610ra3jk_at_4ax.com>

--
Tony944 addressing Birdbrain Macaw:
"I seen and heard many people but you are on top of list being first class
ass hole jerk. ...You fit under unconditional Idiot and should be put in
mental institution.
MID: <VLCdnYC5HK1Z4S3FnZ2dnUU7-dPNnZ2d_at_giganews.com>

--
Pelican to Birdbrain Macaw:
"Ok. I'm persuaded . You are an idiot."
MID: <obru31$nao$3_at_dont-email.me>

--
DerbyDad03 addressing Birdbrain Macaw (now "James Wilkinson" LOL):
"Frigging Idiot. Get the hell out of my thread."
MID: <4d907253-b3b9-40d4-be4d-b32d453937e0_at_googlegroups.com>

--
Kerr Mudd-John about Birdbrain Macaw (now "James Wilkinson" LOL):
"It's like arguing with a demented frog."
MID: <op.yy3c02cqmsr2db_at_dell3100.workgroup>

--
Mr Pounder Esquire about Birdbrain Macaw (now "James Wilkinson" LOL):
"the piss poor delivery boy with no hot running water, 11 cats and
several parrots living in his hovel."
MID: <odqtgc$iug$1_at_dont-email.me>

--
Rob Morley about Birdbrain:
"He's a perennial idiot"
MID: <20170519215057.56a1f1d4_at_Mars>

--
JoeyDee to Birdbrain
"I apologize for thinking you were a jerk. You're just someone with an IQ
lower than your age, and I accept that as a reason for your comments."
MID: <0001HW.1EE2D20300E7BECC700004A512CF_at_news.eternal-september.org>

--
Sam Plusnet about Birdbrain (now "James Wilkinson Sword" LOL):
"He's just desperate to be noticed. Any attention will do, no matter how
negative it may be."
MID: <rOmdndd_O7u8iK7EnZ2dnUU78TGdnZ2d_at_brightview.co.uk>

--
thekmanrocks_at_gmail.com asking Birdbrain:
"What, were you dropped on your head as a child?"
MID: <58ddfad5-d9a5-4031-b91f-1850245a6ed9_at_googlegroups.com>

--
Christie addressing endlessly driveling Birdbrain Macaw (now "James
Wilkinson" LOL):
"What are you resurrecting that old post of mine for? It's from last
month some time. You're like a dog who's just dug up an old bone they
hid in the garden until they were ready to have another go at it."
MID: <59d8b0db.4113512_at_news.eternal-september.org>

--
Mr Pounder's fitting description of Birdbrain Macaw:
"You are a well known fool, a tosser, a pillock, a stupid unemployable
sponging failure who will always live alone and will die alone. You will not
be missed."
MID: <orree6$on2$1_at_dont-email.me>

--
Richard to pathetic wanker Hucker:
"You haven't bred?
Only useful thing you've done in your pathetic existence."
MID: <orvctf$l5m$1_at_gioia.aioe.org>

--
clare_at_snyder.on.ca about Birdbrain (now "James Wilkinson" LOL):
""not the sharpest knife in the drawer"'s parents sure made a serious
mistake having him born alive -- A total waste of oxygen, food, space,
and bandwidth."
MID: <s5e9uclqpnabtehehg3d792tmll73se0g8_at_4ax.com>

--
Mr Pounder exposing sociopathic Birdbrain:
"You will always be a lonely sociopath living in a shithole with no hot
running water with loads of stinking cats and a few parrots."
MID: <os5m1i$8m1$1_at_dont-email.me>

--
francis about Birdbrain (now "James Wilkinson" LOL):
"He seems to have a reputation as someone of limited intelligence"
MID: <cf06cdd9-8bb8-469c-800a-0dfa4c2f9ffa_at_googlegroups.com>

--
Peter Moylan about Birdbrain (now "James Wilkinson" LOL):
"If people like JWS didn't exist, we would have to find some other way to
explain the concept of "invincible ignorance"."
MID: <otofc8$tbg$2_at_dont-email.me>

--
Lewis about nym-shifting Birdbrain:
"Typical narcissist troll, thinks his shit is so grand he has the right to
try to force it on everyone."
MID: <slrnq16c27.1h4g.g.kreme_at_jaka.local>

Rod Speed
Guest

Thu Oct 03, 2019 6:45 pm   



Commander Kinsey <CFKinsey_at_military.org.jp> wrote

> Why do LEDs generate heat?

Because not all the electricity used is turned into light.

Quote:
I want a technical answer not "because they're inefficient".
And will we ever make them more efficient?


Very likely with the higher powered leds.

Peeler
Guest

Thu Oct 03, 2019 7:45 pm   



On Fri, 4 Oct 2019 03:09:32 +1000, cantankerous trolling geezer Rodent
Speed, the auto-contradicting senile sociopath, blabbered, again:


Quote:
I want a technical answer not "because they're inefficient".
And will we ever make them more efficient?

Very likely with the higher powered leds.


You two idiots had better wonder whether they will ever find a cure for
psychopathy and sociopathy which you deranged idiots keep exhibiting here!

--
Website (from 2007) dedicated to the 85-year-old trolling senile
cretin from Oz:
https://www.pcreview.co.uk/threads/rod-speed-faq.2973853/

Robert
Guest

Thu Oct 03, 2019 7:45 pm   



On 03/10/2019 14:29, Commander Kinsey wrote:
Quote:
Why do LEDs generate heat? I want a technical answer not "because
they're inefficient". And will we ever make them more efficient?

Besides the inefficiencies in the LED itself which other posters have
covered, LED lamps have some current regulation or power supply built-in
which will not be 100% efficient and thus generates heat.

Commander Kinsey
Guest

Thu Oct 03, 2019 7:45 pm   



On Thu, 03 Oct 2019 19:29:42 +0100, Robert <robert_at_invalid.invalid> wrote:

Quote:
On 03/10/2019 14:29, Commander Kinsey wrote:
Why do LEDs generate heat? I want a technical answer not "because
they're inefficient". And will we ever make them more efficient?
Besides the inefficiencies in the LED itself which other posters have
covered, LED lamps have some current regulation or power supply built-in
which will not be 100% efficient and thus generates heat.


True, but it's the LEDs themselves that are the warmest, and also the most susceptible to heat.

Peeler
Guest

Thu Oct 03, 2019 8:45 pm   



On Thu, 3 Oct 2019 19:50:02 +0100, NY, the notorious, troll-feeding senile
idiot, blathered again:


Quote:
But if you feel a Philips Hue bulb which is the size of an old tungsten 100W
bulb, the part that gives off light (presumably where the LEDs are) is cool.
It is the neck, near the fitting, which gets hot - and I presume that's
where the PSU is.

Likewise for GU10 bulbs (Philips Hue or ordinary non-dimmable LED) the front
and conical sides don't get hot, whereas the neck near the fitting gets hot.


So, for how long will you idiots still go on like that again? Until the
sociopathic attention whore is fed up with you again? Will you troll-feeding
senile idiots NEVER learn?

Peeler
Guest

Thu Oct 03, 2019 8:45 pm   



On Thu, 3 Oct 2019 19:29:42 +0100, Robert, another brain dead,
troll-feeding, seinile idiot, blathered:


Quote:
Besides the inefficiencies in the LED itself which other posters have
covered, LED lamps have some current regulation or power supply built-in
which will not be 100% efficient and thus generates heat.


Yet another senile idiot who doesn't get what's going on here! <BG>

Rod Speed
Guest

Thu Oct 03, 2019 8:45 pm   



"NY" <me_at_privacy.invalid> wrote in message
news:qn5fss$ca3$1_at_dont-email.me...
Quote:
"Commander Kinsey" <CFKinsey_at_military.org.jp> wrote in message
news:op.z83kvpd1wdg98l_at_picard.lan...
On Thu, 03 Oct 2019 19:29:42 +0100, Robert <robert_at_invalid.invalid
wrote:

On 03/10/2019 14:29, Commander Kinsey wrote:
Why do LEDs generate heat? I want a technical answer not "because
they're inefficient". And will we ever make them more efficient?
Besides the inefficiencies in the LED itself which other posters have
covered, LED lamps have some current regulation or power supply built-in
which will not be 100% efficient and thus generates heat.

True, but it's the LEDs themselves that are the warmest, and also the
most susceptible to heat.

But if you feel a Philips Hue bulb which is the size of an old tungsten
100W bulb, the part that gives off light (presumably where the LEDs are)
is cool.


Mine isnt, its warmer than me.

Quote:
It is the neck, near the fitting, which gets hot - and I presume that's
where the PSU is.

Likewise for GU10 bulbs (Philips Hue or ordinary non-dimmable LED) the
front and conical sides don't get hot, whereas the neck near the fitting
gets hot.


NY
Guest

Thu Oct 03, 2019 8:45 pm   



"Commander Kinsey" <CFKinsey_at_military.org.jp> wrote in message
news:op.z83kvpd1wdg98l_at_picard.lan...
Quote:
On Thu, 03 Oct 2019 19:29:42 +0100, Robert <robert_at_invalid.invalid> wrote:

On 03/10/2019 14:29, Commander Kinsey wrote:
Why do LEDs generate heat? I want a technical answer not "because
they're inefficient". And will we ever make them more efficient?
Besides the inefficiencies in the LED itself which other posters have
covered, LED lamps have some current regulation or power supply built-in
which will not be 100% efficient and thus generates heat.

True, but it's the LEDs themselves that are the warmest, and also the most
susceptible to heat.


But if you feel a Philips Hue bulb which is the size of an old tungsten 100W
bulb, the part that gives off light (presumably where the LEDs are) is cool.
It is the neck, near the fitting, which gets hot - and I presume that's
where the PSU is.

Likewise for GU10 bulbs (Philips Hue or ordinary non-dimmable LED) the front
and conical sides don't get hot, whereas the neck near the fitting gets hot.

Peeler
Guest

Thu Oct 03, 2019 9:45 pm   



On Fri, 4 Oct 2019 05:12:47 +1000, cantankerous trolling geezer Rodent
Speed, the auto-contradicting senile sociopath, blabbered, again:


Quote:
But if you feel a Philips Hue bulb which is the size of an old tungsten
100W bulb, the part that gives off light (presumably where the LEDs are)
is cool.

Mine isnt, its warmer than me.


LOL! Auto-contradicting senile idiot! Let's all hope that you'll SOON reach
room temperature!

--
Sqwertz to Rot Speed:
"This is just a hunch, but I'm betting you're kinda an argumentative
asshole.
MID: <ev1p6ml7ywd5$.dlg_at_sqwertz.com>

Commander Kinsey
Guest

Thu Oct 03, 2019 9:45 pm   



On Thu, 03 Oct 2019 19:50:02 +0100, NY <me_at_privacy.invalid> wrote:

Quote:
"Commander Kinsey" <CFKinsey_at_military.org.jp> wrote in message
news:op.z83kvpd1wdg98l_at_picard.lan...
On Thu, 03 Oct 2019 19:29:42 +0100, Robert <robert_at_invalid.invalid> wrote:

On 03/10/2019 14:29, Commander Kinsey wrote:
Why do LEDs generate heat? I want a technical answer not "because
they're inefficient". And will we ever make them more efficient?
Besides the inefficiencies in the LED itself which other posters have
covered, LED lamps have some current regulation or power supply built-in
which will not be 100% efficient and thus generates heat.

True, but it's the LEDs themselves that are the warmest, and also the most
susceptible to heat.

But if you feel a Philips Hue bulb which is the size of an old tungsten 100W
bulb, the part that gives off light (presumably where the LEDs are) is cool.
It is the neck, near the fitting, which gets hot - and I presume that's
where the PSU is.


Or where the heatsink from the LEDs is.

Quote:
Likewise for GU10 bulbs (Philips Hue or ordinary non-dimmable LED) the front
and conical sides don't get hot, whereas the neck near the fitting gets hot.


Colonel Edmund J. Burke
Guest

Thu Oct 03, 2019 10:45 pm   



On 10/3/2019 6:49 AM, Commander Kinsey wrote:
Quote:
On Thu, 03 Oct 2019 14:29:30 +0100, Commander Kinsey <CFKinsey_at_military.org.jp> wrote:

Why do LEDs generate heat? I want a technical answer not "because they're inefficient". And will we ever make them more efficient?

I got useful answers from Quora:

"LEDs are ever more and more efficient. In the last 40 years, tremendous strides have been made. They generate heat because they are conducting electricity through semiconductors. Unlike metals which have very little resistance to electric currents, semiconductors offer more resistance. Not as much as true nonmetals, but still more than metals. It is the resistance of the semiconductor layers, both N and P, and the resistance of the junction itself, that generate the heat."

"Every electronic device is less than 100 percent efficient. On a low level, it is due to the law of probability, or as the physicists call it, entropy. The odds of all those electrons conveying their energy into photons is very low. Some are always making random transitions, generating heat instead of light."


I wish you'd make a "random transition" the fuck outa here, limey asshole!

Commander Kinsey
Guest

Thu Oct 03, 2019 11:45 pm   



On Thu, 03 Oct 2019 22:21:00 +0100, Colonel Edmund J. Burke <Your_Colonel_at_usa.com> wrote:

Quote:
On 10/3/2019 6:49 AM, Commander Kinsey wrote:
On Thu, 03 Oct 2019 14:29:30 +0100, Commander Kinsey <CFKinsey_at_military.org.jp> wrote:

Why do LEDs generate heat? I want a technical answer not "because they're inefficient". And will we ever make them more efficient?

I got useful answers from Quora:

"LEDs are ever more and more efficient. In the last 40 years, tremendous strides have been made. They generate heat because they are conducting electricity through semiconductors. Unlike metals which have very little resistance to electric currents, semiconductors offer more resistance. Not as much as true nonmetals, but still more than metals. It is the resistance of the semiconductor layers, both N and P, and the resistance of the junction itself, that generate the heat."

"Every electronic device is less than 100 percent efficient. On a low level, it is due to the law of probability, or as the physicists call it, entropy. The odds of all those electrons conveying their energy into photons is very low. Some are always making random transitions, generating heat instead of light."

I wish you'd make a "random transition" the fuck outa here, limey asshole!


Learn to use a killfile.

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