Adafruit TSL2591 High Dynamic Range Digital Light Sensor

When the future is dazzlingly-bright, this ultra-high-range luminosity sensor will help you measure it.
The TSL2591 luminosity sensor is an advanced digital light sensor, ideal for use in a wide range of light situations.

Compared to low cost CdS cells, this sensor is more precise, allowing for exact lux calculations and can be configured for different gain/timing ranges to detect light ranges from 188 uLux up to 88,000 Lux on the fly.
Contains both infrared and full spectrum diodes! That means you can separately measure infrared, full-spectrum or human-visible light. Most sensors can only detect one or the other, which does not accurately represent what human eyes see (since we cannot perceive the IR light that is detected by most photo diodes)
This sensor has a massive 600,000,000:1 dynamic range!
Temperature range: -30 to 80 *C
Voltage range: 3.3-5V into onboard regulator
Interface: I2C
This board/chip uses I2C 7-bit address 0x29 (fixed). Unlike the TSL2561 you cannot change the I2C address, so keep that in mind.

The built in ADC means you can use this with any microcontroller, even if it doesn't have analog inputs. The current draw is extremely low, so its great for low power data-logging systems. about 0.4mA when actively sensing, and less than 5 uA when in power-down mode.
Of course, Adafruit wouldn't leave you with a datasheet and a "good luck!" - they wrote a detailed tutorial showing how to wire up the sensor, use it with an Arduino and example code that gets readings and calculates lux.