How Does a LED Light Work?

A question you may be asking is how does a LED light work? LEDs are essentially transparent devices that produce light. At one end of the device, there are two electrical contacts, and at the other, the light is focused through a rounded lens. This structure is very similar to a miniature light bulb. In essence, LEDs are similar to ordinary light bulbs. Here is an explanation of how an LED produces light.

 

how does a led light work

The LED driver electronics are a vital part of the overall design of an LED light bulb.

The driver electronics convert the input voltage to the required output voltage. LEDs generally require one and a half volts of DC, but input voltage can vary anywhere from 12 volts DC to 240 volts AC. To accomplish this, the driver electronics must use a switch mode regulator, which has high efficiency and lower costs for heat removal.

LEDs have two primary characteristics: color and brightness. The brightness of

an LED is measured in Lumens, a scientific unit for measuring luminous flux. Lumens refer to the total amount of visible light that a light produces. A 5mm LED’s light output is listed in millicandelas (mcd), which depends on the angle of the light source. Some LEDs produce white light, while others emit yellow and red.

The wavelength of the light is determined by the type of semiconductor material used to make it. Different semiconductor materials have different band gaps, and different impurities produce different colors. In general, the bigger the gap, the shorter the wavelength of the light. The same goes for the intensity. Ultimately, an LED is designed to emit a specific wavelength of light, which is called a lumen. For this reason, it can be used as a decorative light for Christmas trees, while saving money on energy bills.

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