4 ms·
> matches daylight. How is this possible for such an old tech? Kind of makes sense when you realize that the sun and an incandescent bulb are both generating l
by function_seven 10y ago
> matches daylight. How is this possible for such an old tech?
Kind of makes sense when you realize that the sun and an incandescent bulb are both generating light as a small slice of their overall thermal radiation envelope. It's just heat, made visible in both cases. And like sibling commenter said, the CRI was defined based on the incandescent.
- mannykannot 10y agoThough the filament would have to be at about the temperature of the sun's visible surface (with some adjustment for atmospheric absorption and scattering) to have the same spectrum. That is about 5700K, and tungsten melts at 3695K. As was mentioned above, the scattering changes quite a lot through the day.
- function_seven 10y agoTrue, though I guess I'm explaining more the continuous nature of the spectrum. LEDs are very notchy or peaky, while light produced from glowing tungsten is a smooth output across the visible spectrum that it covers. The fact that bluer light is scattered by the atmosphere also helps bring sunlight closer to incandescent light in terms of color temperature though, right?