The Thunder Dome Rat in the making....
This device I built uses a miniphotocell (aka LDR...light-dependent resistor) to sense changes in the level of ambient light. The transistor is then turned on or off by the photocell. In bright light the photocell's resistance is low, so the transistor turns off, which turns the LED off. In low light, the photocell's high level of resistance switches the transistor on and the LEDs glow.
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