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Warm white light, high efficiency, true colors


Out of the laboratory: High-flux LED prototype with a feel-good effect

Regensburg, Germany, An LED that offers high efficiency, good color rendering and a pleasant warm white light has now been developed in the laboratories of OSRAM Opto Semiconductors. The prototype therefore offers three important properties that together are essential for general illumination applications, namely a color temperature of 3000 K, a color rendering index of 82 and an efficiency of 104 lm/W.

A new converter mix that OSRAM is currently testing in its development laboratory provides a pleasant warm white light.

The pleasant light from this warm white LED is the result of an advanced conversion process. Not only is the quality of light excellent, the efficiency with which it is produced is also impressive. The combination of these properties is essential for the widespread use of LEDs for general illumination as the warm white light color is targeted specifically at the residential sector. Up to now, efficiencies in excess of 100 lm/W have been achieved only in the cold white spectrum. Dr. Frank Baumann, project manager for the development of warm white LEDs at OSRAM Opto Semiconductors explains: “The successful combination of high quality of light and excellent energy efficiency will bring the commercial breakthrough for LED technology even closer. Efficient feel-good light is no longer just a vision.”

At 3000 K the light color of the LED is similar to that of a halogen lamp. Its color location is precisely on the Planckian curve. The light is exactly white showing no shift to the green spectral region. With an operating current of 350 mA and a chip surface of 1 mm2 the prototype of the new single-chip LED achieves a brightness of 124 lm. This corresponds to an efficiency of 104 lm/W. These record results are based on in-depth OSRAM know-how in providing a new chip architecture in conjunction with improvements in the epitaxial processes, improvements in the converter mix and a highefficiency package. OSRAM will be gradually integrating the new technologies into production.

OSRAM is part of the Industry sector of Siemens and one of the two leading lighting manufacturers in the world. Sales for the OSRAM group worldwide in the year ending September 30, 2008 totaled 4.6 billion euros, 88 percent of which came from outside Germany. OSRAM is a high-tech company in the lighting industry. Over 65 percent of sales come from energy-efficient products. This global player employs more than 43,500 people worldwide, supplies customers in some 150 countries and has 46 production facilities in 17 countries.


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