Does the flashlight app harm i-phone's LED light?

Does the flashlight app potentially do harm to the phone's LED light?

I assume you're asking about iHandy Flashlight, or something like it:
http://www.ihandysoft.com/flashlight.html
All LEDs become less bright as they age, that's just a fact of life. The effect may be so subtle as to not be noticeable though, and I have never experienced a visible light LED actually fail completely.
The fact that the app is in the App Store is sufficient for me to conclude that it will not be harmful.
I imagine your iPhone will be outdated in the four or five years you might be expected to use the app. I wouldn't be concerned about it.

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