Luxi For All is a small attachment for iPhone, iPad, and iPod Touch which works with a FREE app to turn your device into an incident light & color meter (color metering requires a third-party app). When paired with the FREE Luxi™ app, Luxi For All will help you determine the best settings for your DSLR or other camera, so you can take perfectly exposed and color-balanced photos and videos.
Luxi is a small attachment for iOS devices which works with an app to turn your device into anincident light meter. This type of light meter measures the amount of light striking a photographic subject, rather than simply measuring the subject's brightness (which is called "spot metering," and it's how the meter in your camera works). Photos taken with settings suggested by a light meter are often much more pleasing to the eye than photos taken with a simple spot meter.