Darmstadt lights for Germany
LEDs to replace conventional lighting? If we know already from everyday life. But on German roads has not yet managed the diode light. A new test project will change that - with regard to humans.
The LED is the diva with the street lamps. It is light and durable, but only if it is controlled with the right electronics. As the "High-Power LED she wants are further cooled properly, otherwise it dies a heat death. Because the benefits of technology but the cost savings are greater and because local authorities in the street long before, there are test projects on the use of diodes in the public sector.
The new Darmstadt project are: the Technical University of Darmstadt, Darmstadt, Germany, the power company HEAG Südhessische Energie AG (HSE) and the Siteco Ltd. is dedicated to not only good at pure power: "In this pilot project will be in Europe for the first time LED lights with compared to existing lighting technique and measured by test subjects in real conditions, "said project leader Prof. Dr. Tran Quoc Khanh from the Department of lighting technology at the TU Darmstadt.
So then compared in the Grillparzerstrabe, a typical suburban street with 30-speed zone and calm traffic, the new LED lights with three traditional lighting techniques under realistic conditions. And it should not only numbers and values are: goes, "We will also discuss the physiological and psychological effect of the LED light, as it is perceived by pedestrians and motorists," said Christoph Schiller, one of the project's concern.
Because of their light color of 4000 Kelvin, while the LED is in neutral white area (compared to the bulb is warm white, LED flashlights are partly a bluish). But as with the xenon light in modern car headlights, which is seen against the measured values as dazzling, the LED could also encounter problems of acceptance.
The comparative candidate known to every German: The white glowing mercury vapor lamps, developed in the 30s. However, you have a bad energy yield and are ripe for sampling. Then there are today used its successor, the sodium vapor lamps with the distinctive yellow light. They are even as an exchange option for the old versions of the mercury-case in the test road in place and as a standalone version with a new lamp design.
Stands as a representative of the new LED technology, the LD-10 of the Company in the fourth Siteco Grillparzerstrabe the measurement field. Your design with the kobraformigen head is striking, but a matter of taste. The actual work provided 86 high-power LEDs, which are associated with advanced technology for possible permanent lights.
The LEDs will be more economical, but they can not perform miracles. "Where a mercury vapor lamp 50 lumens per watt This unit describes how to efficiently implement a lamp energy. Higher values are better. Light produced, creating an LED is estimated that "70-75 lumens per watt, clarified Christoph Schiller. No revolution, then, but a significant savings. More impressive is the durability of LEDs - she is almost four times longer than conventional lamps. For the damp German municipalities could expect the new technology also.
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