LEDs ♦ news digest
Clinton Global Climate Initiative, the energy used by street lights amounts to the third largest use of power by local governments today. Many cities in America could see reductions up to 40 percent or as much as $17 million in yearly energy costs, simply by converting their existing conventional streetlights to the Bridgelux LED.
“All cities are facing a similar fiscal dilemma; they need to upgrade their infrastructure, but lack the capital to move forward,” says Jim Davis, President of Chevron Energy Solutions. “Through this new initiative, we can help cities modernise their infrastructure by financing projects through energy savings. These LED streetlights are making a dramatic difference, but they are just the start of what we can do to help cities save on their energy costs.”
“Our community is excited about the evaluation we are doing with Chevron Energy Solutions and Bridgelux,” adds Tim Sbranti, mayor of Dublin. “All of us in city government look forward to the energy savings and improved street level visibility. We think this could be a successful financing model for many of our infrastructural improvement projects.”
The heart of the streetlight is an LED lighting module designed to be installed or upgraded quickly and easily into the existing streetlight head. Designed by Bridgelux, the module contains the light source and other components most subject to rapid evolution. As the technology advances in energy efficiency and capabilities, it is anticipated that modules could be simply swapped out without having to replace a city’s physical infrastructure.
The module also allows cities the potential of upgrading streetlights in the future to incorporate sensing and networking capabilities, giving city managers tools to control their lights and monitor traffic or remote locations, something impossible with conventional streetlights.
“LED lighting is the biggest advance in lighting since Thomas Edison showed off his bulb in 1879,” said Bill Watkins, CEO of Bridgelux. “But LEDs and solid-state lighting represent more than just a technical advance. They will usher in new business models and capabilities for running our homes, businesses and cities. Lights are going to become more than just something you screw into a socket.”
The new Oslon SSL LEDs by Osram Opto Semiconductors generate a particularly high light output with a long lifetime on a small surface - even at high temperatures
Thanks to this optimisation, the luminaire design is significantly simplified and the new generation of Oslon SSL LEDs, presents a particularly temperature stable light source. The LED provides a luminous flux of typically 98 lm in warm white (3,000 K), with an operating current of 350 mA at an application temperature of 85°C in the chip.
With its typical luminous efficacy of 96 lm/W, referring to the ratio between luminous flux and expended electrical output, it is among the most efficient 1 mm²-Chip-LEDs presently to be found on the market. The combination of higher luminous flux and reduced forward voltage of 3.1 V provides an efficiency increase of approximately 25 percent, when compared with the previous generation.
For manufacturers of lighting solutions, this makes luminaire development much easier: a smaller number of LEDs attains the same luminous flux, as well as the same efficiency as before.
March 2012
www.compoundsemiconductor.net 59
Oslon stabilises the temperature in its new SSL LED
By reducing the variation of the luminous flux in the LED at elevated temperatures, it is now possible to retain a virtually constant luminous efficacy at high application temperatures
The new generation of high-power Oslon SSL-LEDs by Osram Opto Semiconductors will be appreciated by users for their improved performance, with an efficiency increase of approximately 25 percent.
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