App note from OSRAM on their ALS device SFH5701, its operation and application method. Link here (PDF)
The SFH5701 is a small, two-wire, linear output current ambient light sensor (ALS) with current amplifier and dark current compensation. The ALS is capable of resolving a wide range of ambient light levels (10 mlx – 10 klx) tailored to the spectral response of the human eye and operational from -40 °C to 100 °C.
from Dangerous Prototypes https://ift.tt/2G54sfa