Extremely rare on carry guns in LE or civilian context (mil too as far as I know but not certain).
White light is more common, but still pretty rare.
When a civilian has a white light on a carry handgun, odds are good that he’s carrying an extra mag, two knives, an “admin” light, and has an IFAK on his ankle.
Not saying that’s good or bad, just saying that’s the type that I usually see with a white light.
Now, for guys that do training, larping, etc, with tactical gear including long guns, it’s a different story. White lights are much more common on those handguns. Lasers are still rare.