Description: This is a very small light sensor. A photocell changes (also called a photodetector, photo resistor, CdS or photoconductive cell) resistance depending on the amount of light it is exposed to. These little sensors make great ambient light triggers (when light in the room turns on, do something).
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Used with a 10K fixed resistor in a voltage divider and it provides a very good dynamic range through a normal room lighting range.
Works as expected, no problems.
I have used many of these because I often want to adjust what happens when the lights are on vs. off. I have checked several and they seem to be fairly consistant.
Using it with an arduino uno for measuring ambient light level. Works great.