Awesome
Adafruit TSL2591 Library
<img src="https://cdn-shop.adafruit.com/970x728/1980-07.jpg" height="300"/>This is an Arduino library for the TSL2591 digital luminosity (light) sensors.
Pick one up at http://www.adafruit.com/products/1980
You'll also need the Adafruit_Sensor library from https://github.com/adafruit/Adafruit_Sensor