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LED street lighting: new technology helps save electricity

More economical street lighting
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M an knows the principle of the division of labor, among other things, of freight trains. Sometimes they are pulled by two locomotives. What is used for maximum power in rail transport can also be used on a smaller scale in order to achieve greater energy efficiency. Researchers at the Karlsruhe Institute of Technology (KIT) have developed a new LED street light that is even more economical than conventional LEDs. Instead of high-performance diodes, several weaker LED modules were arranged in a special way, which enabled the power consumption of these lights to be reduced by a further 20 percent.

“We have succeeded in comparing the efficiency and service life of the lamps to significantly increase conventional LED luminaires again ”, says Michael Heidinger from the Light Technology Institute (LTI) of KIT.

More LEDs, less voltage

Up to 48 light modules were opened in Karlsruhe a circuit board mounted. In contrast to the parallel connection or a connection of the individual LEDs in series, the voltages could be reduced significantly: from over 120 to only 20 volts. Another advantage is the lower risk of failure. With several LEDs connected in parallel, the failure of a diode leads to a failure of the entire system. known from fairy lights. The arrangement on a circuit board allows the remaining diodes to continue to shine if one of them fails.

The street lights equipped with this technology mean lower maintenance costs and significantly lower energy consumption for the city or municipality in which they are used . For a medium-sized city with 320,000 inhabitants, the Karlsruhe researchers expect maintenance and electricity costs to be 30 percent lower.

High savings for cities and municipalities

In Karlsruhe, where the information from the municipal utilities According to 55,000 lamps illuminating streets and sidewalks, 35 percent of which work with LEDs, the annual costs could drop from three to around two million euros per year if the new lights were completely converted.

The combinations are weaker LED should also be more pleasant for the human eye. At a certain distance from the eye to the points of light, the brain perceives the lamp as a surface emitter that is less dazzling.

In the Rhineland-Palatinate community of Maxdorf, west of Mannheim, the first street lamps with the new ones have now been installed LED equipped. After this first pilot test, the manufacturer intends to use the technology for further cityand local government.

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