ImageLight-dependent resistor -- a.k.a., photoresistor or Cadmium-Sulfide (CdS) cell. As their name suggests, these are resistors whose resistance is a function of the amount of light falling on them. Their resistance is very high when no light is present (up to millions of Ohms), and significantly lower when they are illuminated (hundreds of Ohms).

LDR is, of course, another TLA.

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