Miniature Light Dependent Resistor. Photoconductive cadmium sulphide light dependent resistor (LDR) in miniature epoxy sealed open frame package (4mm dia.). Cell resistance reduces as light falling on the device increases. Typical applications include light control, cameras, toys etc. Sold as pack of 10.• Peak spectral response: 540nm.• Light resistance: 50-100Kohm • Dark resistance: 20Mohm minimum• Max. voltage: 100V• Power max: 90mW• Working temp. range: -20 to +60°