How many hours can the iPhone 4's camera flash last before it burns out? Have there been any studies done / reports published, or is it just assumed that you probably will need a new iPhone before the flash dies (with normal use)?
So, now that we know that we have a LED (Light Emitting Diode) in there, let’s see how much should that live (according the the super-experts @ wikipedia):
LED Lifetime and Failure (read all that for more info)
Now do you think your iPhone will last 25,000 hours (worst case scenario for the LED)? That’s a little bit less than three years. It’s certainly possible for an iPhone to last much more than that (I still use a 1s-gen iPhone), however, I highly doubt that you’re going to use it with the flash ON, for three years, non-stop. :)