Light Sensing LED Flashlight

From Instructables user MITinventorbot:

Every day, lots and lots of electricity and energy is wasted from people accidentally leaving electronics on, or flashlights. This invention is the perfect solution to that problem. The flashlight only turns on when it senses that the room is dark enough to need a light. It reduces energy and electricity waste, and makes sure you never leave your flashlight on. This is also a very simple circuit, so it is good for beginners, and can be modified to suit your needs.

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