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There are different methods of determining the voltage of an LED. If the wave length is known the minimum voltage to create light can be calculated<br> | There are different methods of determining the voltage of an LED. If the wave length is known the minimum voltage to create light can be calculated<br> | ||
http://www.pveducation.org/pvcdrom/properties-of-sunlight/energy-of-photon ( | http://www.pveducation.org/pvcdrom/properties-of-sunlight/energy-of-photon (or [http://www.oksolar.com/led/led_color_chart.htm LED color chart]) | ||
If the wave length is unknown the LED can be connected to an adjustable voltage source via a large resistor and the voltage can be gradually increased until a small current flows through the LED (for example 1mA will be ok for most LEDs without destroying them). Then the voltage of the LED can be measured (in parallel to the LED). | If the wave length is unknown the LED can be connected to an adjustable voltage source via a large resistor and the voltage can be gradually increased until a small current flows through the LED (for example 1mA will be ok for most LEDs without destroying them). Then the voltage of the LED can be measured (in parallel to the LED). | ||