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.

• owsei@programming.dev ⁨17⁩ ⁨hours⁩ ago

  Have you touched strong incandescent lights?

  Sure LED arrays are hot, but cooler than old lights

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• ChaoticNeutralCzech@feddit.org ⁨14⁩ ⁨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.

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  • A_Random_Idiot@lemmy.world ⁨13⁩ ⁨hours⁩ ago

    So yes, LEDs are hot.

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    • ChaoticNeutralCzech@feddit.org ⁨6⁩ ⁨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)

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• Apepollo11@lemmy.world ⁨14⁩ ⁨hours⁩ ago

  That’s fair - my experience with handling them basically stops at individual LEDs in electronics and domestic LED lightbulbs.

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