Monday, 28 March 2011

LED street lighting in China

LED know-how in street lighting is on the advance across the world. As part of the Chinese "10 cities 10,000 lights" project, three districts in the capital Beijing were equipped with led street luminaires by the HBTechnology CAST Group, using OSLON SSL LED by OSRAM Opto Semiconductors. They make definite that the busy streets are brightly lit & save up to 50% in energy compared with conventional luminaires.

In some parts of Beijing, led modules for street luminaires with an output of 120W or 180W now replace the conventional 250W or 400W sodium vapour lamps. As a result, these urban districts accomplish energy savings in street lighting of up to 50%. For the metropolis of Beijing with its high energy consumption, this is of great importance. In addition to energy efficiency, light quality also played a major role in the decision for conversion. Dong Cheng, Chao Yang & Da Xing are urban districts bustling with life. For that reason, excellent illumination was necessary to increase safety for both drivers & pedestrians.

The city planners decided in favour of the powerful OSLON SSL LED by OSRAM Opto Semiconductors. They are part of the 1-W class; with their compact size of only 3 x 3 millimetres, they are currently the smallest LED in their class & luminous efficacy on the market. Even at higher flux rates, they work reliably & effectively. Their nice color rendering index with natural appearance of colors & clearly contoured rendition of contrasts provides additional safety on Beijing's streets.

Three urban district in China's capital Beijing now benefit from LED street lighting, providing bright & homogeneous illumination of the busy streets.
Optimum integration
OSLON SSL LED have a beam angle of 80 degrees & are thus ideally 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 & they have no issues integrating them in to the outside lenses. The result is homogeneous & powerful illumination of the streets without liht pollution", explains Bing Hu, Managing Director of the HBTechnology CAST Group. The long lifespan of OSLON SSL LED also leads to lower maintenance requirements, which might otherwise have obstructed the flow of traffic & generated additional costs.

Less is more

Especially thanks to their capability of handling high-current lots, OSLON SSL LEDs can be used to recognize energy- and cost-saving lighting solutions. At an operating current of 350 mA, this light source achieves a typical brightness of 110 lm in ultra-white (5700 and 6500 K). At an operating current of 350 mA as well as a color temperature of 3000 K it achieves a typical efficiency of 82 lm/W as well as a brightness of 92 lm. And brightness is an impressive 156 lm (warm white) at an operating current of 700 mA. "This lets us recognize lighting applications requiring lots of light by using fewer LEDs. If, as planned, Beijing converts all of its street lighting to LED, the savings potential is enormous", states Kai-chong Cheng, Marketing Director at OSRAM Opto Semiconductors in Asia.

China is the leading market in LED street lighting, representing approx. 50% of applications worldwide. The pilot project in the capital is to be followed by other cities.

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