Is safe(and ok for my phone) to have my iphone light on all night?

Is safe(and ok for my phone) to have my iphone light on all night? - 1

Yes. It's an LED light and causes no hazard. It will drain your battery.

No it will burn out the bulb much faster.

What eric said

If you mean the light on the camera, it might overheat. If you just mean the screen, it's safe to leave that on all the time, although it will use up the battery quickly.