great app

Im a lighting engineer and have worked with a lot of lighting test instruments.
1. This app is working on my iPhone 4
2. This app can measure the Lamp Bulb color temperature
3. The accuracy, remember the Color Temp on the lamp brochure is based on Lab Test where the electrical voltage and frequency is precise, and the figure (i.e 6500) is a rounded-up, that way we cannot expect the reading from this app is the same with the lamp brochure. So the accuracy of this app is something that we can say "acceptable" considering the measurement is "on site" where the voltage and frequency is not precise.
Hope my review is usefull.

Sacha van Diest about LightSpectrum Pro