Possible Duplicate:
wp8 – Reflection API issue – Please check
I know you can control the camera flash but that only seems to actually turn on the flash when you take a picture or record video. I also found one other way to turn it on by focusing the camera.
Is there a way to turn the LED flash on without either of these battery intensive hacks?
Yep, it’s possible to do that on WP8 using public APIs, please see my answer @ Reflection failure when attempting to access Microsoft.Phone.Media.Extended
There’s also a way to do that for WP7, see @ http://www.locked.nl/wp7-flashlight-getting-started