You can wire the maximum number of LEDs to a 12-volt source by connecting series LED strings to the source in parallel. It is best to use LEDs with the same forward voltage and forward current characteristics. Voltage and current calculations will be easier, and circuit behavior will be consistent. When you connect LEDs in series their forward voltages accumulate. The total current through the series string equals the forward current of a single LED. The total forward current that the source must handle will be the sum of the forward currents of all of the series strings connected to in parallel. Writer Bio
