We have an old iPhone 4 that we use as a music machine in a spare room. Will using the flash as a nightlight overnight cause any damage?
My guess is no, but a part of me (maybe thinking of old camera flashes) thinks I should ask first.
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I would say no for two reasons,
The flash on an iPhone is an LED which unlike old camera flashes doesn't mind running for extended periods of time.
Flashlight use isn't limited by iOS. If the letting the flash run for a while would break the phone apple wouldn't allow you to do so or at the very least set a timer to turn it off after so long.
The only problem T could see is the bulb will eventually burn out, but considering you don't seem to need the camera anyway that probably isn't an issue for you.