This is a very small light sensor . It is called light sensor or photocell or LDR (light dependent sensor) or photo-resistor. A photocell changes 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).
Features
Light resistance : ~1k Ohm
Dark resistance : ~10k Ohm
Max voltage : 150V
Max power: 200mW
Dimensions
2 x 10 x 12mm
10 mm between pins
31mm lead length
What is LUX and what LUX value for diffrent light conditions, Click here
For LDR (light dependent resistor) datasheet and tutorial, Click here
For GL5528 photo-resistor datasheet, Click here
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