[giantg2]

I think you have it backwards - light is a term used for specific bands of the EM spectrum. Nobody is calling their FM radio waves light emissions. Unless this is a naming collison with the already established x-rays.

[CamperBob2]

It's an established term in physics. E.g., https://lightsources.org/

[mikkupikku]

Everybody says "ultraviolet light" even though it's invisible.

[ThePowerOfFuet]

Not all light is visible.

[mikkupikku]

Right, hence "visible light". So I don't see the problem with saying x-ray light either.