When the LED is turned-off, it continuously senses the environmental light level. In case light intensity falls bellow a pre-defined value, the LED is turned-on in a pulsed way so that during the off time interval it senses again the light levels. Shall the light intensity rise above threshold level the LED is then turned-off. So the LED acts as light sensing and light emitter device. Compact analog design. Supply 9V.
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