2013年11月11日星期一

The integrated driver within the canopy housing further simplifies installation

By using a variety of beam angles and warm white color temperature from the Definity lamps, the museum exhibits now capture the attention of viewers as intended and creates areas that truly engage visitors.The essence of the new museum is dramatically different," said Steve Hansen, Director of the Sioux City Public Museum. "The new lighting brings the museum into the modern age and that was our ultimate goal. Our team could not be more pleased with Hilferty's direction of the project and their decision to use LED lamps from Lighting Science.Cree reports a breakthrough innovation in canopy LED lighting with the introduction of the CPY250 canopy and soffit lighting series. According to Cree it Consumes 75 percent less energy than the led flood light systems it’s designed to replace and 5–15 percent less energy with more than 35 percent increased performance compared to competing higher-cost LED luminaires, the new CPY Series delivers exceptional visual environments across a range of canopy applications, including gas stations, bank drive-through ATMs and hotel/airport drop-off centers.

“Canopy operators are under constant pressure to lower operating costs while simultaneously providing safe and visually appealing lighting,” said Greg Merritt, vice president, lighting at Cree. “The new CPY Series, with its slim, low-profile design, is the perfect upgrade solution. The high-performance LED luminaires not only outperform existing LED and MH solutions but also enable the lowest total cost of ownership objectives to be achieved.Available in both flat and prismatic drop lens, the CPY250 provides two illumination aesthetics to meet the visual, as well as the vertical and horizontal illumination, performance needs of a typical canopy application. The CPY250 can seamlessly mount to virtually any canopy deck and is secured in place with self-sealing screws that provide a reliable water-tight seal. The integrated driver within the canopy housing further simplifies installation, reducing installation time and cost. The new canopy series also features Cree’s 10-year limited warranty.

Green-emitting nitride semiconductor Led high bay light structures tend to suffer from low light output due to the difficulty in producing the high-indium-content indium gallium nitride (InGaN) needed for longer-wavelength light emission. Apart from the material quality challenge, strain induced by the lattice mismatch with pure GaN leads to large piezoelectric effects, giving electric fields that tend to pull electrons and holes apart, reducing rates of recombination into photons.The Chinese team tackled the problem by inserting a layer of lower-indium-content InGaN before the high-In-content light-emitting layer. Simulations were carried out first, suggesting that such a layer could reduce the strain-dependent electric fields in the active light-emitting multiple quantum well (MQW) structure.

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