Summary for LED Testing Conditions

What is LED?

A Light Emitting Diode (LED) is a special type of diode that emits monochromatic, discontinuous light when a forward voltage is applied—a phenomenon known as electroluminescence. By altering the chemical composition of the semiconductor material, LEDs can produce near-ultraviolet, visible, or infrared light. Initially, LEDs were primarily used as indicator lights and display panels. However, with the advent of white LEDs, they are now also employed in lighting applications. Recognized as the new light source of the 21st century, LEDs offer unparalleled advantages such as high efficiency, long lifespan, and durability compared to traditional light sources.

Classification by Brightness:

• Standard Brightness LEDs (made from materials like GaP, GaAsP)
• High-Brightness LEDs (made from AlGaAs)
• Ultra-High-Brightness LEDs (made from other advanced materials)
• ☆ Infrared Diodes (IREDs): Emit invisible infrared light and serve different applications.

LED Reliability Testing Overview:

LEDs were first developed in the 1960s and were initially used in traffic signals and consumer products. It is only in recent years that they have been adopted for lighting and as alternative light sources.

Additional Notes on LED Lifespan:

The lower the LED junction temperature, the longer its lifespan, and vice versa.

LED lifespan under high temperatures:

• 10,000 hours at 74°C
• 25,000 hours at 63°C
• As an industrial product, LED light sources are required to have a lifespan of 35,000 hours (guaranteed usage time).
• Traditional light bulbs typically have a lifespan of around 1,000 hours.
• LED streetlights are expected to last over 50,000 hours.