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Single led - Leds in series - Leds in parallelVoltage drop is typically 1.9 - 2.1V for Red, Yellow & Orange, 3.0 - 3.3V for White, Blue, Green & UV and 1.2V for Infrared LEDs. Current is usually between 10 - 20mA. Supply Voltage - depends what you have at your disposal, typically 3V, 6V or 12V source.
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