I installed this new app on my iPhone4. The App can be set to display foot candles and in Lux. The application is compatible with the iPhone 3GS and above and uses both front and back camera’s and has a built in timer. Make sure that you turn your phone onto mute otherwise you might get a constant photo shutter sound, depending on your settings.
I like how it makes suggestions about what the light level it is measuring are useful for. Nice addition. The app can be flipped to use the front or rear camera.
I own a Hagner Lightmeter and did some comparative tests. Obviously it has limitations due to using the iPhone camera. I found that it was much better in non directional highly diffused lighting situations, which is expected. In those situations it was quite good, in others it could be measuring low by 33% or more.
I think it could give you perfect figures in an overcast sky simulator but not when the light has very directional properties, especially at low angles.
Find the app in the app store as "Lightmeter by whitegoods" and here is some more information http://jump.dexigner.com/news/24636
I am interested in your tests and views! What did you think about it?
Hi Rogier, indeed, would be nice to catch up!. By the way, the app also has a switch to measure in footcandles as well as in lux. So with a professional view on the limitations and what you are measuring, it is a handly app to have in your pocket for those occasions where you are travelling light (no pun intended... well almost ;-)