Inside a solar charged LED lamp.

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A look at the very simple circuitry in a solar powered LED lamp that has a detachable solar panel that is used to charge the lamp for later use.

The resistor measures around 5 ohms (marked 4.7) and the voltage drop across it varies from .6 to 1V approximately depending on the lithium cell’s charge state. That gives a current of around 100 to 200mA through the 12 LEDs so typically about 15mA per LED.

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