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Sunday, September 18, 2011

Osram LED spotlight achieves 124,000 cd at 7.5 degrees in lab

Researchers from Osram are claiming record-breaking performance for an LED spotlight they developed that can achieve a rating of 124,000 cd at 7.5 degree coverage angle. The LED spotlight performance rivals that of high-intensity discharge spotlights.

Osram AG, the Munich, Germany-based lighting unit of Siemens AG, has successfully generated a rating of 124,000 cd for an LED spotlight in the laboratory with a coverage angle of 7.5 degrees. The company is claiming record-breaking performance with this lamp. Researchers combined a warm-white color temperature (3000K) and good color rendering (Ra=92, R9=97), with a power range that rivals that of high-intensity discharge (HID) lamps.

As a comparison, a 70W HID spotlight with reflector can typically achieve 82,000 cd rating with a 9 degree coverage angle.

The LED spotlight meets the minimum illumination requirement of 3000 lux. At one-meter distance, illumination is 124,000 lux; at five-meters distance it is 5000 lux, making it suitable for construction sites. Power consumption is 60W. The luminous flux of the LED spot in continuous operation is 4075 lm.
Laboratory results of LED spotlight achieve 124,000 cd at 7.5 degree coverage angle

In order to attain these high ratings, the phosphors as well as the connection technology were adjusted for optimum results. The lamp uses the UX:3 LED from Osram Opto Semiconductors. The LED can be operated with a higher current, therefore decoupling more light from the chip than is the case with standard technologies. In addition, the power supply does not run via the chip surface, but is integrated within the chip itself. Thus, the light is radiated more homogenously and is designed to arrive at the illuminated object more homogenously.

The LED spotlight is designed for architecture, studios and shop illumination. Long lifespan of 50,000 hours reduces maintenance cost and the inconvenience of installing new lamps at great heights, for instance, in churches and castles. Since LEDs do not emit UV or IR illumination, they are compatible with park areas and museums.

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