Light Sensitive Photo Resistor

A photo cell (also called a photo resistor, photo detector, CdS or photoconductive cell) allow you to detect light. Its resistance depends 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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Light Sensitive Photo Resistor is available to buy in increments of 5

A photocell, photoresistor or light-dependent resistor (LDR) is a light-controlled variable resistor. The resistance of a photoresistor decreases with increasing incident light intensity; in other words, it exhibits photoconductivity. A photoresistor can be applied in light-sensitive detector circuits, and light- and dark-activated switching circuits.

A photoresistor is made of a high resistance CdS semiconductor. In the dark, a photoresistor can have a resistance as high as a few megaohms (MΩ), while in the light, a photoresistor can have a resistance as low as a few hundred ohms. If incident light on a photoresistor exceeds a certain frequency, photons absorbed by the semiconductor give bound electrons enough energy to jump into the conduction band. The resulting free electrons (and their hole partners) conduct electricity, thereby lowering resistance.


  • Model Number: Photoresistor Cell 1K 5528 5mm
  • Lead Free Status: Lead free / RoHS Compliant 
  • Maximum Operating Temperature: -40°C ~ 125°C  
  • Operating Temperature: -40°C ~ 125°C 
  • Dissipation Power: 1W-6W 
  • Application: Watch Supply Voltage: 1.5V-6V

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