system
Given the following post, respond as if you're commenting on Reddit:
human
What determines the frequency "mix" of emitted photons that make white light?

Since there is no such thing as a white photon, what mechanism in a white light determines the "mix" (production) of other photons appropriate to make the output white? 

Crudely, does a white light think "a few red ones now, a few blues one now, add a little green here" etc...
gpt
> Crudely, does a white light think "a few red ones now, a few blues one now, add a little green here" etc...

There is no mechanism in white light that determines mixing or producing photons to make the output white. It literally is just your eye that, when it sees the appropriate proportion of different wavelengths of light originating from *roughly the same angle* that interprets it as white. No joke. Just put a red, green and blue light close together and it will look white to you.

Of course, when humans make something like a white surface, then obviously the surface material is deliberately selected so that it diffusely reflects in a reasonable proportion all frequencies of visible light in order for it to look white.

Check out computer pixels at close range.