The light sensor BT50i measures light intensity and has three measurement ranges, which can be selected using a switch. Because of its ranges the sensor is suitable as well for indoor as for outdoor measurements. Full sun illumination is within the range of the sensor. The spectral response of the sensor approximates the response of the human eye.

Ranges: 0 ... 1500 lux, 0 ... 15000 lux, and 0 ... 150000 lux
Resolution (12-bit): 0.37 lx, 3.7 lx, 37 lx

Can be used to:
• verify inverse square law,
• investigate light reflection and absorption,
• study solar energy,
• monitor monitoring sunrise and sunset times.