Electrical Test and Electric Motors

The principle of light emitting diodes is the emission of light by a semi-conductor as an
electrical current passes through it. LEDs are commonly found in numerous applications, but the recent development of white or blue diodes with a high light output opens new perspectives, especially for signaling (traffic lights, exit signs or emergency lighting).

The average current in a LED is 20 mA, the voltage drop being between 1.7 and 4.6 V
depending on the color. These characteristics are therefore suitable for an extra low voltage power supply, especially using batteries. A converter is required for a line power supply.

The advantage of LEDs is their low energy consumption. As a result, they operate at a very low temperature, giving them a very long service life. Conversely, a simple diode has a weak light intensity. A high-power lighting installation therefore requires connection of a large number of units in series.

These diodes are used particularly where there is little power available.

Related News:

Royal Philips Electronics has announced the introduction of LivingColors, an exciting and innovative new form of home lighting using LEDs which allows you to alter the color of the light in your home, so that you can adapt the lighting to your circumstances and create the atmosphere of your choice. Read about it here.