Osram Opto Semiconductors Oslon Square LED

Excessive heat generation is one of the main reasons why light-emitting diodes fail. With the Oslon Square, Osram Opto Semiconductors presents an LED that withstands high ambient temperatures particularly well.

To ensure that the colours of several LEDs in a luminaire remain uniform even at higher temperatures, they are measured and binned at 85°C, a temperature that comes close to that encountered in lighting applications within buildings, in everything from spotlights to retrofit light sources.

The company has optimised the heat dissipation of the product to allow an increase in the junction temperature. With higher permitted junction temperatures, fewer large heat sinks are required. This simplifies the design of lamps and luminaires because they can be smaller and therefore less costly. The product can reach a lifetime of over 50,000 h even at high temperatures of up to 135°C in the LED.

Measuring and binning at operating temperatures of 85°C is important to users who further process the light-emitting diodes into luminaires. They receive precise information on parameters such as luminous flux or colour stability, which they need to optimally define the properties of their products. Furthermore, the improved temperature behaviour leads to higher luminous efficacy in the application.

The product is particularly suitable for the various applications in buildings. With a colour temperature ranging between 2400 and 5000 K, it can generate either warm- or cold-white light. The colour rendering index is over 80 and the luminous flux is 202 lm.