I2C
https://github.com/claws/BH1750
https://github.com/Genotronex/BH1750FVI_Master
https://giltesa.com/2013/09/21/sensor-de-luz-bh1750fvi
http://henrysbench.capnfatz.com/henrys-bench/arduino-sensors-and-input/icsg020a-bh1750-arduino-light-intensity-meter-tutorial/
1,20 €
Aliexpress