Color and voltage of LEDs
The operating voltage of LEDs depends on the color. This is an indication of discrete energy levels and the photon character of light.
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The abstract principle of the quantization of energy in the form of photons is demonstrated clearly in an extremely simple experiment with four LEDs and a power supply unit. Red LEDs light up at a voltage from about 1.5 volts, yellow from about 1.9 volts, green from about 2.3 volts and blue from about 3.3 volts.
Instructions for building a variable LED color mixer can be found in the experimentation instructions “Experiments – energy quantization with LEDs" on the media portal of the Siemens Stiftung.