Description :

• This is a very small light sensor. A photocell changes (also called a photodetector, photoresistor, 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).:

Features

• 
  Light resistance : ~1k Ohm
  Dark resistance: ~10k Ohm
  Max voltage : 150V
  Max power: 100mW* 2 x 4 x 5mm
  4mm between pins
  31mm lead length