Package includes: 1 piece x 5 mm LDR Sensor
 
A photoresistor or light dependent resistor is a component that is sensitive to light. When light falls upon it then the resistance changes. Values of the resistance of the LDR may change over many orders of magnitude the value of the resistance falling as the level of light increases.
It is not uncommon for the values of resistance of an LDR or photoresistor to be several megohms in darkness and then to fall to a few hundred ohms in bright light. With such a wide variation in resistance, LDRs are easy to use and there are many LDR circuits available. The sensitivity of light dependent resistors or photoresistors also varies with the wavelength of the incident light.
LDRs are made from semiconductor materials to enable them to have their light sensitive properties. Many materials can be used, but one popular material for these photoresistors is cadmium sulphide, CdS.
 
Features & Specifications:
Diameter: 5mm
Cell resistance:400 ohm to 9K ohm (1000 LUX 10 LUX)
Dark resistance: 1M ohm
Operating Temperature: -60 to +75 Deg. C
 
Applications:
Automatic Street Light
Detect Day or Night
Automatic Head Light Dimmer
Position sensor
Used along with LED as obstacle detector
Automatic bedroom Lights
Automatic Rear view mirror
Oil Burner Flame Out
Absence / Presence (beam breaker)
Position Sensor 
Automated Rear View Mirror 
Camera Exposure Control
Auto Slide Focus - dual cell
Photocopy Machines - density of toner
Colorimetric Test Equipment
Densitometer
Electronic Scales - dual cell
Automatic Gain Control – modulated light source 
 
Bullet Points:
1 piece x 5 mm LDR Sensor
Diameter: 5mm
Cell resistance:400 ohm to 9K ohm (1000 LUX 10 LUX)
Dark resistance: 1M ohm
Operating Temperature: -60 to +75 Deg. C