Awasome 5V Led Light Circuit References. Web try to build the first circuit to flash white led from a single cell. The forward voltage is 2v, as indicated by a graph of typical operating conditions found in the data sheet (figure 2).
Web usb led lamp circuit is a simple solution to this. The circuit is built on a breadboard, and uses a 9 v battery, red led and 470 ohm resistor. The number of leds per meter (lpm) factors in the power calculation as well.
