Widely used in camera phones for over five years now, the LED fash/video light in your phone can exhibit different lighting properties than the xenon gas tube flash used in a typical camera flash.
Although an LED has the potential to strobe faster than a xenon tube, I have noticed the flash duration is quite long as demonstrated in this night snowflake smear I shot with a Motorola Droid.
Using the LED flash can produce a flashlight painting technique with fast moving subjects, while slower objects are frozen with the flash.
On the Droid, you have an option to use the flash in automatic mode, which will fill-flash dim ambient light, and to force it to be on or off for each shot. The LED can be used as a light source to enhance video.
Also a must have for LED enabled Android smartphones is an app to use the light source as a flash light/ video light. Droidlight is free app, one of several in the Android Market.
To use the LED as a video light. Run an LED flashlight app in the background and roll your video.
Note: The battery will drain much faster while using the LED as a video light.
Although this article is five years old, it's an interesting read about LED phone camera flashes. http://www.ledsmagazine.com/features/2/4/1/1
I've actually heard that using the rear facing LED camera light for too long can burn it out - this app developer actually decided NOT to build the camera light functionality into their popular flash light app for Android - http://bit.ly/9pCJUV
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