OSRAM launches LEDs that offer longer life at higher temperatures

OSRAM Opto Semiconductors optimizes heat dissipation of OSLON Square, leading to lower lighting costs


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. To ensure that the color point of each LED in a luminaire remains uniform even at higher temperatures, they are measured and binned at 85 degrees Celsius (° C). This temperature comes very close to that encountered in lighting applications within buildings, in everything from spotlights to retrofit light sources.

OSRAM has optimized the heat dissipation of the OSLON Square to allow an increase in the junction temperature.  With that, the OSLON Square can reach a lifetime of more than 50,000 hours, even at high temperatures up to 135° C in the LED.  Due to higher permitted junction temperatures, fewer large heat sinks are required, simplifying the design of lamps and luminaires because they can be smaller and, therefore, less costly.

“With our new conversion technology, we can produce significantly thinner converter layers. The thinner layers better dissipate the heat, thus enabling the higher temperatures in the LED,” said Marc Dyble, SSL Product Marketing Manager at OSRAM Opto Semiconductors, explaining the advantages of the innovative technology.

Customers benefit from the properties of the new OSLON Square

Measuring and binning at operating temperatures of 85° C is significant to customers who further process LEDs into luminaires. Customers receive precise information on parameters such as luminous flux or color stability, which is needed to optimally define the properties of their products.

Furthermore, the improved temperature behavior leads to higher luminous efficacy in the application. “This luminous efficacy, which is the ratio of luminous flux to applied electrical power, helps our customers significantly optimize the price/performance ratio of their luminaire solutions,” Dyble said.

Application in interior lighting

The OSLON Square is particularly suitable for various building applications. With a color temperature ranging between 2400 and 5000 Kelvin, the LED can generate either warm- or cold-white light. The color rendering index is over 80 and the luminous flux is 202 lumens (lm). Product variations with a different color temperature spectrum and higher color rendering indexes are to follow.

Currently, the new LED is undergoing extensive quality testing and the certification process under the LM-80 long lifetime standard is in progress. The results of the 3,000 hour test are expected at the end of the year, and the results of the 6,000 hour test are expected in spring 2014.

OSLON Square LED Paramaters

For more information on OSLON Square click here


OSRAM, with its headquarters in Munich, is one of the two leading lighting manufacturers in the world. Its subsidiary, OSRAM Opto Semiconductors GmbH in Regensburg (Germany), offers its customers solutions based on semiconductor technology for lighting, sensor and visualization applications. OSRAM Opto Semiconductors has production sites in Regensburg (Germany) and Penang (Malaysia). Its headquarters for North America is in Sunnyvale (USA). Its headquarters for the Asia region is in Hong Kong. OSRAM Opto Semiconductors also has sales offices throughout the world. For more information go to www.osram-os.com.