This sensor is logarithmic over a large dynamic range of 3 to 55,000 Lux, so it has a lot of sensitivity at low light levels but is also nearly impossible to "max out" so you can use it indoors or outdoors without changing code or calibration. Since the sensor is fabricated on a chip, there are also fewer manufacturing variations, so you won't have to re-calibrate the sensor from one board to another.
For more information including graphs, power consumption, etc check out the datasheet. On this breakout we placed a 68KΩ resistor from OUT to ground to turn the current into a voltage.
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