Physics Colloquium
November 28th, 2012, Biotech Auditorium, 4:00PM - 5:00PM
Host: Professor James Napolitano
Michael S. Shur
Center for Integrated Electronics
ECSE and Physics
Rensselaer Polytechnic Institute
“Beyond Sunlight: Color Rendition Engine”
Today, over 20% of energy use is in lighting, and, replacing conventional light sources with Light Emitting Diodes (LEDs) can save half or more of this energy. LEDs have a very high efficiency (exceeding 100% at low power levels) and lifetimes projected to exceed 100,000 hours.[1]But LEDs produce colored light, and white LED light sources combine light produced by several LEDs of different colors or by LEDs and fluorescent phosphors. Optimization of multi color LED modules is one of the most important problems of the emerging smart solid-state lighting technology. Such optimization must rely on metrics describing the quality of white light. Conventional and generally accepted metrics of light quality are inaccurate and misleading, and we introduced statistical metrics of color rendition[2] used to design and implement a color rendition engine.[3] Versatile color rendition solid state lampswith adjustable spectrum have beenused for treating seasonal affective disorder[4], growing plants[5], evaluating color rendering[6], illuminating art objects[7] and will find many otherindustrial and medical applications.
Blue LED on Si (courtesy of Sensor Electronic Technology, Inc.) /
Edison bulb replica (1879)
© Michael Shur (2012) /
Versatile solid state lamp (from 1)
[1] A. Žukauskas, M. S. Shur, and R. Gaska, Introduction to Solid State Lighting, John Wiley and Sons, 2002, ISBN: 0471215740
[2]A. Žukauskas, R. Vaicekauskas, F. Ivanauskas, H. Vaitkevičius, P. Vitta, and M. Shur, New Statistical Figures of Merit for Color Quality of Solid-State Lamps, ECS Transactions, 19 (12), 13-20 (2009)
[3]Artūras Žukauskas, R. Vaicekauskas, P. Vitta, Arūnas Tuzikas, A. Petrulis, and Michael Shur, Color rendition engine, Optics Express, Vol. 20 Issue 5, pp.5356-5367 (2012)
[4] A. Žukauskas, R. Vaicekauskas, F. Ivanauskas, G. Kurilcik, Z. Bliznikas, K. Breive, J. Krupic, A. Rupsys, A. Novickovas, P. Vitta, A. Navickas, V. Raskauskas, M.S. Shur and R. Gaska "Quadrichromatic white solid state lamp with digital feedback" In: Third International Conference on Solid State Lighting, Ed: I.T. Ferguson, N. Narendran, S.P. DenBaars, J.C. Carrano. Proc. SPIE 5157, 185-198 (2004)
[5]G.Tamulaitis, P.Duchovskis, Z.Bliznikas, K.Breivė, R.Ulinskaitė, A.Brazaitytė, A.Novičkovas, A.Žukauskas, and M.S. Shur, High-power LEDs for plant cultivation, SPIE Proceedings, 5530-24
[6] R.Stanikunas, H.Vaitkevicius, A.Svegzda, V.Viliunas, Z.Bliznikas, K.Breive, R.Vaicekauskas, A.Novickovas, G.Kurilcik1 A. Zukauskas, R.Gaska, and M.S.Shur, Color perception under illumination by quadrichromatic solid-state lamp, SPIE Proceedings, 5530-47
[7] P. Vitta, A. Tuzikas, A. Žukauskas, R. Vaicekauskas, A. Petrulis, and M. S. Shur, Lighting Engine for Art and Museum Display, presented at LS13 Conference, June (2012)