From the OSRAM Laboratory: Efficiency Record for Warm White
Mar 15, 2011 OSRAM Opto Semiconductors has set a new laboratory record of 142 lm/W for the efficiency of a warm white LED light source. With a correlated color temperature (CCT) of 2755 K the LED achieves a good color rendering index (CRI) of 81. Measurements were taken under standard conditions: room temperature and pulsed mode at an operating current density of 350 mA/mm².
The peak value of 142 lm/W measured under standard conditions is achieved at a color perception that very closely matches that of a classic incandescent lamp (color coordinates cx 0.46/ cy 0.41 on the Planckian curve).
The increase in efficiency was made possible by combining new procedures in thin-film and UX:3 chip technologies and in conversion. Development engineers at OSRAM Opto Semiconductors have benefited here from combined know-how in all aspects of the production process. These include epitaxial growth, thin-film chip architectures, conversion processes and package technologies.
Author: BIO T&T
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