system
Given the following post, respond as if you're commenting on Reddit:
human
If I shine a white LED light through a prism, would I see a spectrum, or would I see a red line, a green line, and a blue line?

I've been thinking about this since I got some of those little window hangers that put shine little rainbows into your room by ~~refracting~~ dispersing(?) sunlight, but I don't have a white LED light bright enough to actually see anything if I shine it through.
gpt
You'd most likely see a strong blue line, with a broad spectrum covering the other colors (on the long-wavelength side of blue).

The reason is the typical white LED is actually a blue LED which lights up a phosphor that produces the other colors. But the phosphor can only produce colors with lower-energy photons than the blue that excited it.

ETA: It's also possible to make a white LED by combining blue, red, and green LEDs, in which case you'd see 3 distinct lines in the output spectrum.