As part of the Chinese "10 cities 10,000 lights" project, three districts in Beijing were equipped with light-emitting diode (LED) street luminaires by the HBTechnology Cast Group, using Oslon SSL LED by Osram Opto Semiconductors. They ensure that the busy streets are brightly lit and save up to 50% in energy compared with conventional luminaires.
In some parts of Beijing, LED modules for street luminaires with an output of 120 W or 180 W now replace the conventional 250 W or 400 W sodium vapor lamps. As a result, these urban districts achieve energy savings in street lighting of up to 50%. In addition to energy efficiency, light quality also played a major role in the decision for conversion. For the urban districts of Dong Cheng, Chao Yang, and Da Xing, excellent illumination was required to increase safety for both drivers and pedestrians.
The city planners decided in favor of the Oslon SSL LED by Osram Opto Semiconductors. They measure 3 x 3 millimeters, and their good color rendering index with natural appearance of colors and clearly contoured rendition of contrasts provides additional safety on Beijing's streets. Oslon SSL LEDs have a beam angle of 80 degrees and are thus well suited for street lighting; the ideal beam angle for this application is 120 x 80 degrees.
"In this way, the LEDs meet all of our technical requirements and we have no problems integrating them into the external lenses. The result is homogeneous and powerful illumination of the streets without light pollution," said Bing Hu, managing director of the HBTechnology Cast Group. The long lifespan of Oslon SSL LEDs also results in lower maintenance requirements, which might otherwise have obstructed the flow of traffic and generated additional costs.
The pilot project in the capital is to be followed by other cities.