news digest ♦ LEDs
So Long and other researchers at Missouri S&T, in partnership with the Missouri Department of Transportation, have developed an instrument to measure LED intensity. The laser-guided device allows measurements to be taken from the roadside at night, instead of requiring technicians to physically check traffic lights by using a bucket truck.
Long’s team created the measurement tool while working to provide MoDOT with a data-driven replacement schedule for LEDs, which have been widely adopted for use in sustainable traffic signal management.
“The majority of agencies replace LED signals on a spot basis when they receive a complaint,” she says. “The maintenance costs associated with sending a crew out to replace a single LED are very high. Our methodology provides a more cost- effective mechanism for determining replacement and allows agencies to meet goals of being good stewards of public money.”
Long says in addition to addressing individual complaints about brightness, transportation officials have used a generic replacement schedule based on the manufacturers’ warranties, usually six years. But since life expectancy of LEDs varies by intersection and the basic science of LED components, that’s not the most cost-effective schedule.
Results of this study, named one of the 2012 “Sweet 16” High Value Research Projects by the American Association of State Highway and Transportation Officials, appears in the Engineering Management Journal’s special issue on transportation management this month.
The team plans to extend the previous data and collect data from the same LED traffic indicators in the coming years to improve the reliability and accuracy of their results.
Optogan LEDs light up sports field in Malta
Dynamically use of the III-nitride LED DSF lighting will reduce electricity cost enormously and the expected return on investment is around 5 years
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www.compoundsemiconductor.net October 2012
On Friday 14th September 2012 the renovated Luxol Sport field in Pembroke Malta was officially opened by Norman Darmanin Demajo, President of the Malta Football Association ( MFA ).
Also present were Pieter Bregman, official Optogan`s distributor in Malta and Ove Sörensen, Director of Sales & Business Development at Optogan.
The opening took place during the evening match between 2nd division teams Gharghur and San Gwann, where everybody could enjoy the game with the new DSF (Dynamic Sport Field) LED lighting of Optogan.
“It’s finally here! An outdoor field where we can provide activities for all levels in football, from 3rd Division to Premier League and all Youth games,” said the President of MFA, Norman Darmanin Demajo during the inauguration ceremony. Now the sports field is equipped with an excellent Optogan DSF light, teams can play also in the evening with the advantage of great light, good uniformity of the light and quality lighting for the viewers.
With its high intensity of 280 lux, Optogan DSF offers a great performance and improvement, comparing to the old traditional lighting that provided only 96 lux. Thanks to the dynamic use of light, the light can be controlled and dynamically changed from orientation (10 percent), to training (50-70 percent) to game play (100 percent), and also only one half of the pitch can be illuminated.
With all these lighting options, the Optogan LED DSF Lighting is an energy saving system, which, in the case of LUXOL, is saving energy from 35.2KWh to 27.2KWh. And it can be even more, if used dynamically. Since the light is purely on the
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