LED offers longer lifetime at high temperatures
To ensure that the colors 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.
Osram has optimized the heat dissipation of the Oslon Square to allow an increase in the junction temperature. The new conversion technology produces thinner converter layers which better dissipate the heat to enable the higher temperatures in the LED. The Oslon Square can reach a lifetime of more than 50,000 hours even at high temperatures of up to 135°C in the LED.
Measuring and binning at operating temperatures of 85°C is useful to customers who further process the light-emitting diodes into luminaires. They receive precise information on parameters such as luminous flux or color stability, which they need to optimally define the properties of their products.
The improved temperature behavior leads to higher luminous efficacy in the application.
The Oslon Square is suitable for the various applications in buildings. With a color temperature ranging between 2,400 and 5,000 Kelvin, the device can generate either warm- or cold-white light. The color rendering index is over 80 and the luminous flux is 202 lumens. Product variations with a different color temperature spectrum and higher color rendering indices are to follow.
At present, the new LED is undergoing extensive quality testing. The certification process under the LM-80 long lifetime standard is underway. The results of the 3,000 hour test are expected at the end of the year, those of the 6,000 hour test in spring 2014.
Visit Osram Opto Semiconductors at www.osram-os.com
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