in general: Can the LEDs on smartphones be used as flashlights (if supported by ROM)?

Most smartphones nowadays come with LEDs for the camera.
A lot of ROMS (stock and custom) provide a switch where these LEDs can be used as a flashlight.

Is it safe to use the camera LEDs as flashlight, on all ROMs, on all Devices? (generally said)
Is it safe to do so for a longer time?

Are there ROMs tweaked in a way the LEDs are brighter than normally and therefore having them on for some time will cause damage to them, because it is outside their normal operating voltage? Or are the LEDs limited in voltage/current hardwareside, so that longer use does no harm? (again, generally said)

If not, how do I find out, if the LEDs on a specific device can be used as a flashlight for longer time?

I am asking these questions not for a specific device, but in general.

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