Lighting Research Center
LRC Intranet Web mail Lighting Research Center

Press Release


Back To Newsroom

News from the Lighting Research Center
                             Rensselaer Polytechnic Institute

Contact:   Rebekah Mullaney
Lighting Research Center
(518) 276-7118
  Newsroom Home
  Project Posters
  In the News
  About Us
  Contact Us
Troy, N.Y. -  4/2/2015

LRC Doctoral Student's Paper Most Popular SPIE Digital Library Download

A published paper by Lighting Research Center doctoral student Indika U. Perera was ranked as a top SPIE Digital Library download for the month of February 2015 ( The paper, “Mathematical model to analyze phosphor layer heat transfer of an LED system,” was one of two top downloads for the month under the category of light sources and illumination.

The paper focuses on determining the temperature distribution based on light propagation in the phosphor layer of a light-emitting diode (LED) system. With the quantity of luminous flux now increasing from phosphor-converted white LEDs, the heat generation within the phosphor layer has become an issue for reliable performance. The predicted temperature distribution using Perera’s mathematical model showed good agreement with experimentally measured temperature values. The model can be used to predict the temperature distribution in an LED phosphor layer under different heat transfer conditions to provide insight that is difficult to observe in experimental studies.

The paper was presented at the Thirteenth International Conference on Solid State Lighting, held in San Diego, CA, in August 2014, and published in the conference’s SPIE proceedings, volume 9190 (

This is the second paper that Perera has published on this topic, which is the basis for his dissertation work. The first paper was presented at ITHERM 2014: The 14th IEEE Intersociety Conference on Thermal and Thermomechanical Phenomena in Electronic Systems, held in Lake Buena Vista, FL, in May 2014, and published in the conference’s IEEE proceedings.

Perera holds a bachelor’s degree in mechanical engineering from the University of Moratuwa, Sri Lanka, a master’s degree in mechanical engineering from Purdue University, and a master’s degree in lighting from Rensselaer. He is expected to graduate with a doctoral degree in architectural sciences with a concentration in lighting in December 2015.

About the Lighting Research Center
The Lighting Research Center (LRC) at Rensselaer Polytechnic Institute is the world's leading center for lighting research and education. Established in 1988 by the New York State Energy Research and Development Authority (NYSERDA), the LRC conducts research in light and human health, transportation lighting and safety, solid-state lighting, energy efficiency, and plant health. LRC lighting scientists with multidisciplinary expertise in research, technology, design, and human factors, collaborate with a global network of leading manufacturers and government agencies, developing innovative lighting solutions for projects that range from the Boeing 787 Dreamliner to U.S. Navy submarines to hospital neonatal intensive-care units. In 1990, the LRC became the first university research center to offer graduate degrees in lighting and today, offers a M.S. in lighting and a Ph.D. to educate future leaders in lighting. Learn more at

About Rensselaer Polytechnic Institute
Founded in 1824, Rensselaer Polytechnic Institute is America's first technological research university. Rensselaer encompasses five schools, 32 research centers, more than 145 academic programs, and a dynamic community made up of more than 7,900 students and more than 100,000 living alumni. Rensselaer faculty and alumni include more than 145 National Academy members, six members of the National Inventors Hall of Fame, six National Medal of Technology winners, five National Medal of Science winners, and a Nobel Prize winner in Physics. With nearly 200 years of experience advancing scientific and technological knowledge, Rensselaer remains focused on addressing global challenges with a spirit of ingenuity and collaboration.