BH1721 - Ambient Light Sensor
The BH1721 is an ambient Light Sensor which uses I2C for communication. It has a wide output range from 1 – 65528 lux. It can be used in applications like automatically changing the screen brightness according to ambient light or automatically changing LED bulb intensity according to ambient light.
For a detailed look at the specifications, refer to the datasheet: https://fscdn.rohm.com/en/products/databook/datasheet/ic/sensor/light/bh1721fvc-e.pdf