5mm Photoresistor/LDR sensor Photoresistor is a resistor which made of semi-conductor material, and the conductance changes with luminance variation. The photoresistor can be manufactured with different figures and illuminated area based on this characteristic. Photoresistor is widely used in many industries, such as toys, lamps, camera, etc. Tipycal Applications for cds photoresistor 1. Camera automatic photometry 2. Photoelectric control 3. Indoor ray control 4. Annunciator 5. Industrial control 6. Light control switch 7. Light control lamp 8. Electronic toy. Cheap 5mm LDR photocell Fast response to daylight Great spectrum characteristics High reliability, good price Direct supply. 100pcs/small package, 1000pcs/ big package.