news digest ♦ LEDs
industry’s best colour qualities, creating more inviting and better lit environments for student residents while significantly reducing the school’s operational expenses compared to outdated lighting technologies.
“We’ve received nothing but positive feedback from our student residents, especially when they learn about the energy efficiency of the LED fixtures and that lighting maintenance requests are a thing of the past,” says Barry Olson, director of business administration for campus life, NC State.
“The Wolf Ridge at Centennial student housing project called for the installation of thousands of luminaires, many of which operate 24/7,” adds Pete Fraccaroli, facilities manager, campus life, NC State. “We needed an advanced lighting solution that allowed us to exceed LEED certification requirements and provide students superior colour quality while delivering drastically reduced maintenance and energy costs to the university. The Cree LED lighting installed solved all of these problems.”
When fully completed, the six-building project will utilise more than 4,000 luminaires from Cree’s LED lighting portfolio. The hallways and stairwells are lit with Cree CR22 and CR24 LED architectural troffers and the Cree CR Series Light Engine, offering beautiful light quality and significant energy savings.
The apartments’ interior space features the Cree SL24 LED Surface Linear luminaire, providing high-quality illumination in a versatile design that installs in minutes. Additionally, the university was so impressed with the light quality in previous Cree LED lighting installations around campus, NC State installed Cree CR6 LED downlights in the Wolf Ridge bathrooms.
“The installation at NC State is a testament to the positive impact on students and staff when high-quality lighting is installed,” says Mike Bauer, vice president of lighting sales, Cree. “Students and faculty can feel good about the mercury-free LED lighting replacing the old fluorescent fixtures and the additional energy savings, all helping to create a substantially beneficial environmental impact.”
In 2007, NC State was the first to join Cree’s LED University, an international community of universities working to accelerate the adoption of energy-efficient LED lighting across their campuses. Universities in the program include the University of Notre Dame, Marquette University, University of California at Santa Barbara, University of Arkansas and many others.
IHS: GaN-on-Si LEDs to rocket from 1 to 40 percent marketshare
Apart from the fact that silicon substrates are cheap, 8-inch CMOS semiconductor companies will find it relatively inexpensive to shift to growing gallium nitride-on-silicon LEDs. This will make GaN-on-silicon increasingly popular over LEDs grown on sapphire and SiC substrates
The penetration of GaN-on-silicon wafers into the LED market is forecast to increase at a compound annual growth rate of 69 percent from 2013 to 2020.
By this time they will account for 40 percent of all GaN LEDs manufactured, according to a new report from IHS.
In 2013, 95 percent of GaN LEDs will be manufactured on sapphire wafers, while only 1 percent will be manufactured on silicon wafers. The growth in the manufacturing of GaN-on-silicon LEDs between 2013 and 2020 will take market share from both sapphire and SiC wafers.
The figure below shows the GaN-on-silicon LED market share outlook in terms of revenue for the packaged LED market.
“Manufacturing large ingots made from sapphire is difficult, whereas silicon wafers are available from 8 inches up to 12 inches and are generally cheaper and more abundant,” says Dkins Cho, senior analyst for lighting and LEDs at IHS. “There is a large pre-existing industry for silicon-based manufacturing that is leveraged to create economies of scale and reduce the cost of an LED.”
Repurposing manufacturing facilities to accommodate the shift toward GaN-on-silicon LEDs is generally accepted to require minimal investment. Companies that previously manufactured CMOS semiconductors already own legacy 8-inch CMOS fabrication units that can be
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www.compoundsemiconductor.net January / February 2014
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