this is a cheap and easy way to use the usb power for the purpose of getting light. it consists of led, a transistor and some resistors. this can be used as a light source for the webcams at night, it can also be used as a table lamp also. if you like the circuit please rate it . parts list ...By: sooraj619
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Source: http://www.instructables.com/id/Usb-powered-Light-with-dark-sensor/
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