Osram Opto Semiconductors announced to have developed Oslon Square, an LED with outstanding heat resistance. Contrary to common binning and LED measurements taking place under an ambient temperature of 25° Celsius, Oslon Square was measured and binned at 85° Celsius (Tj = 85°C) which reflects the real temperatures achieved within indoor lighting applications.
 
Remarkably, the Oslon Square LED has an increased current of 1.8 A compared to previously 1.5 A whilst at the same time the thermal resistance value was improved from formerly 3.8 K/W to 3.0 K/W. The all in all higher heat resistance now ensures uniform LED colour rendering at higher temperatures, a better heat dissipation and a longer lamp life.
 
The new Oslon Square technology is based on new conversion technology that allows to produce thinner converter layers with better heat dissipation. Osram claims its Oslon Square can reach a life-time of “considerably more than 50.000 hours” at even high junction temperatures of “up to 135° Celsius”. That's a dramatic improvement to the maximum heat resistance of traditional LEDs at 90° Celsius.
 
   

Osram furthermore emphasizes the aspect of financial savings connected to the new technology. Increased luminous efficacy in terms of lumens per Watt will help to optimize price/performance ratio of the LED luminaire and because less large heat sinks are required, the design of the lamps will be simplified and smaller, hence less costly. Furthermore, the improved temperature behavior leads to higher luminous efficacy in the application.

The Oslon Square is particularly suitable for indoor lighting with a color temperature ranging between 2,400 and 5,000 Kelvin. The color rendering index is over 80 and the luminous flux is as high as 202 lumens. Currently the new LED is undergoing extensive quality testing on the base of LM-80 long lifetime standard is underway. sm