They also add a radiator to keep the charade
Apepollo11@lemmy.world 1 week ago
But the sun is hot. You can feel the heat radiating from it.
LEDs are not hot - that’s pretty much the main reason that they’re energy efficient, they don’t waste energy as heat.
It’s not suddenly gotten colder, so if they did switch to LEDs, then they’re also artificially compensating for the heat. Which would completely defeat the purpose of switching (presumably from an incandescent bulb) to LEDs.
Also, I’m super intrigued about who is supposedly behind this sun-bulb maintenance, and more interestingly, what could possibly be powering it
driving_crooner@lemmy.eco.br 1 week ago
A_Random_Idiot@lemmy.world 1 week ago
Someones never accidentally touched an LED array.
I can guarantee you an LED array as big as the sun would generate enormous amounts of heat.and would need massive amounts of cooling.
owsei@programming.dev 1 week ago
Have you touched strong incandescent lights?
Sure LED arrays are hot, but cooler than old lights
ChaoticNeutralCzech@feddit.org 1 week ago
LED chips can’t get above 150 °C or they fail. So high-power LED lights need appropriate cooling. And the heatsink is big and thermally conductive, making it feel hotter to the touch than it is (it delivers more heat to you finger over time). Meanwhile, the glass of some bulbs can exceed 300 °C but cools down to safe levels in a minute (or less if xou touch it with something) because it’s thin.
Also, 150 °C (420 K) objects do radiate heat as black-body radiation but not that much, also it’s far-IR so only detectable with thermal cameras. Meanwhile, a light bulb’s filament is 2700 K (3000 K in halogen ones) and the Sun’s surface is 6000 K, and both produce copious amounts of near-IR light that largely contributes to the heat felt on one’s skin when illuminated.
A_Random_Idiot@lemmy.world 1 week ago
So yes, LEDs are hot.
ChaoticNeutralCzech@feddit.org 1 week ago
From a human’s standpoint, we say they’re “hot”. The fact that humans can’t handle 150 °C nor 2700 °C does not mean there’s no difference between the temperature of a sausage fresh off the grill and magma. (Yes, by the time it gets to the surface, lava is too cold)
ChaoticNeutralCzech@feddit.org 6 days ago
Power density of the Sun is approximately 276.5 W/m³. That’s counterintuitively little. A classic LED 3mm plastic package has the volume of less than 40 mm³ and some white ones can handle about 100 mW without a heatsink. Even leaving space for connections and airflow, you can easily overpower the Sun by volume by orders of magnitude.
A fun article mentioning that 276.5 W/m³ is about a reptile’s metabolism (and they famously produce little body heat): what-if.xkcd.com/148/
On replacing the Sun with another light source: what-if.xkcd.com/151/
Basically, as this Stack Exchange discussion correctly states, human intuition is quite useless when thinking about things orders of magnitude outside our experience.
Meanwhile, you say “hot” because that’s what your finger felt. Not really convincing of your ability to think in cosmic proportions.
A_Random_Idiot@lemmy.world 5 days ago
So yes, LEDs are hot.
Apepollo11@lemmy.world 1 week ago
That’s fair - my experience with handling them basically stops at individual LEDs in electronics and domestic LED lightbulbs.