Datasheet
This sensor is much like the TSL2561 but with a wider range (and the interface code is
different). This sensor has a massive 600,000,000:1 dynamic range! Unlike the TSL2561
you cannot change the I2C address either, so keep that in mind.
© Adafruit Industries https://learn.adafruit.com/adafruit-tsl2591 Page 4 of 22