Using it on an iPhone4, awesome app definitely does what it says and does it surprisingly well but dont leave it on for any extended periods of time. I set it down on my desk forgetting it was still running and the whole phone is warm to the touch.
Calibration is useful for us pros that have the 18% grey balance cards and typically have someone in a wedding party for example hold it so we can manually white balance our cameras but for an app like this Im really not sure the reason behind white balancing an app that measures light intensity in a particular spot.
TZZDC1241 about LiMe Capture