High Dynamic Range Digital Light Sensor

This luminosity sensor is an advanced digital sensor that allows for exact lux calculations that can be configured to detect light ranges from 188 uLux to 88,000 Lux. This sensor also has both infrared and full-spectrum diodes, which means it can measure infrared, full-spectrum light, or human visible light. To make this sensor even better, it has a 600,000,000:1 dynamic range!

You can find a detailed tutorial and example code here.