Whitegoods Lighting has recently released an updated version of its Light Meter App.
Updates in the new version include an easy to use manual calibration tool where you can input readings taken from a real light meter allowing for more accurate calibration, improved the decimalisation of Lux/foot-candle readings, and default settings for low/medium or bright light levels to improve performance.
The new version works with front and back cameras and includes a built-in timer. The app is compatible with iPhone 3GS, 4 and 4S, iPad and iPod Touch.
more: itunes.apple.com (233)