Comment

Comment on If the color of the Sun was orange, wouldn't the clouds and everything white also be orange? My friend is adamant that 30 years ago the "real" Sun was orange but got replaced with a white LED.

Apepollo11@lemmy.world ⁨1⁩ ⁨day⁩ 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

source

Sort:hotnew top

A_Random_Idiot@lemmy.world ⁨21⁩ ⁨hours⁩ ago

LEDs are not hot

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.

source
- owsei@programming.dev ⁨19⁩ ⁨hours⁩ ago
  Have you touched strong incandescent lights?
  
  Sure LED arrays are hot, but cooler than old lights
  
  source
- ChaoticNeutralCzech@feddit.org ⁨16⁩ ⁨hours⁩ 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.
  
  source
  - A_Random_Idiot@lemmy.world ⁨15⁩ ⁨hours⁩ ago
    So yes, LEDs are hot.
    
    source
    ChaoticNeutralCzech@feddit.org ⁨8⁩ ⁨hours⁩ 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)
    
    source
- Apepollo11@lemmy.world ⁨16⁩ ⁨hours⁩ ago
  That’s fair - my experience with handling them basically stops at individual LEDs in electronics and domestic LED lightbulbs.
  
  source
driving_crooner@lemmy.eco.br ⁨22⁩ ⁨hours⁩ ago
They also add a radiator to keep the charade

source