A Large Light Dependent Resistor (12mm / 20mm LDR Photoresistor) is a heavy-duty passive optical sensor whose electrical resistance varies inversely with incident light intensity. Featuring a larger Cadmium Sulfide (CdS) sensing surface area compared to standard 5mm LDRs, it offers higher power dissipation and increased light collection sensitivity. Under dark conditions, its internal resistance remains extremely high, dropping to very low ohmic levels when exposed to bright light. Its sturdy 2-pin radial leads allow easy mounting on circuit boards or terminal connectors.

This product is featured by Famephase Electronic Accessories as an essential component for high-sensitivity outdoor lighting controllers, industrial light meters, solar trackers, and optoelectronic sensing systems.