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Photoconductive cells are sensors that allow you to detect light. They are small, inexpensive, low power, easy to use, and don't wear out. NTEs light dependent resistors LDR are photoresistors whose resistance decreases with increasing incident light intensity. In other words, when it is dark, they have a high electrical resistance and when it is light, their electrical resistance is low.
NTE Electronics part number 02-LDR23