Energy Savings Potential of LEDs for Energy Efficient Lighting and Future Research Directions скачать в хорошем качестве

Energy Savings Potential of LEDs for Energy Efficient Lighting and Future Research Directions

Steven Denbaars National Academy of Engineering Symposium March 22, 2012 LEDs fabricated from gallium nitride have lead to the realization of high-efficiency white solid-state lighting. At UCSB’s Solid State Lighting and Energy Center we have fabricated advanced GaN white LEDs structures which exhibit luminous efficacy greater than 150 lm/Watt, and external quantum efficiencies higher than 50%. This has helped enabled LEDs lighting to compete with traditional lighting technologies such as incandescent and CFL. A review of the energy savings potential of LED based lighting compared to traditional technologies will be addressed. The U.S. Department of Energy estimates that in 2030 the energy savings from LED lighting in the U.S. alone would amount to over $250 billion in energy savings, which is equivalent to 50 Gigawatt size power plants. Further improvements in materials quality and cost reduction are necessary for wide-spread adoption of LEDs for lighting. Solid-state lighting has the potential to achieve 85% energy efficiency, corresponding to 255 lm/watt, and be able to run entirely off sustainable energy sources such as either solar, thermoelectric or wind. Key problems and new research directions in solid state lighting technologies will be highlighted.