Yiting Zhu

Document Type



Over the past decade, high-brightness monochromatic (colored) LEDs have been replacing traditional incandescent light sources in certain niche applications such as traffic signals and “EXIT” signs. LEDs are able to save up to 80% energy and significantly reduce maintenance costs in these applications. A similar trend is expected in architectural, transportation and general illumination with white LEDs. Even though the efficiency and light output of white LEDs have been improving steadily, they still need to improve by twice as much and offer good color appearance before they achieve the target of 200 lumens per watt with high color quality, as set by the SSL industry.

Publication Date



Link Foundation Fellowship for the years 2007-2009.



To view the content in your browser, please download Adobe Reader or, alternately,
you may Download the file to your hard drive.

NOTE: The latest versions of Adobe Reader do not support viewing PDF files within Firefox on Mac OS and if you are using a modern (Intel) Mac, there is no official plugin for viewing PDF files within the browser window.