The State of Solid-State [Lighting]

Architectural SSL, Feb. 2014, by Barbara Horwitz-Bennett.
http://issuu.com/constructionbusinessmedia/docs/1402_archssl (scroll to page 12)

"Innovations to light source technology, particularly in the form of ceramics and chip-on-board arrays continue to help the development of life and performance of LED, while simultaneously helping to bring down cost."