Published on April 24, 2017
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.
