And feet. Athlete’s foot is a thing, wearing the same kind of shoes all the time doesn’t help with moisture.

Edit: just read the last three words… Well at least now there’s an explanation why it’s bad for feet.

Yes, and blending in between, including RGB, can enhance the quality of light as well to estimate a natural light source.

There’s various metrics, like CQS, CRI or newer versions of it.

It’s basically about how close the wavelength spectrum is compared to a black-body radiator given a color temperature (e.g. an incandescent lamp or the sun).

Though IME, the light quality of a real white LED is better than the mix of an RGB led. Also interesting: the cooler the LED is the higher the quality of the light.