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Proceedings Paper

Optimization of multichip white solid state lighting source with four or more LEDs
Author(s): Arturas Zukauskas; Felikas Ivanauskas; Rimantas Vaicekauskas; Michael S. Shur; Remis Gaska
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Paper Abstract

Polychromatic solid-state lamps that produce white light by additive mixing of the emissions from primary colored light emitting diodes (LEDs) should have a higher luminous efficiency that those using phosphors. These lamps require emission spectra that feature an optimal trade-off between luminous efficacy and color rendering. We developed a mathematical technique that allows us to maximize the luminous efficacy and general color rendering index (CRI) for the white solid-state lamp composed of an arbitrary number of primary LEDs with given spectra. We use this method in order to compare the optimal efficacy and general CRI for 4 and 5 primary LEDs with that for 2 and 3 LEDs. For a particular color temperature, the required number of primary LEDs depends on the trade-off between efficacy and general CRI. The quadrichromatic lamp is shown to meet requirements for most practical applications. Quintichromatic lamps and lamps with a higher number of primary LEDs yield negligible benefit in improving color rendering. However, quintichromatic LED lamps are capable of producing quasi-continuous spectra that might meet special lighting needs.

Paper Details

Date Published: 5 December 2001
PDF: 8 pages
Proc. SPIE 4445, Solid State Lighting and Displays, (5 December 2001);
Show Author Affiliations
Arturas Zukauskas, Vilnius Univ. (United States)
Felikas Ivanauskas, Vilnius Univ. (Lithuania)
Rimantas Vaicekauskas, Vilnius Univ. (Lithuania)
Michael S. Shur, Rensselaer Polytechnic Institute (United States)
Remis Gaska, Sensor Electronic Technology, Inc. (United States)

Published in SPIE Proceedings Vol. 4445:
Solid State Lighting and Displays
Ian T. Ferguson; Yoon-Soo Park; Nadarajah Narendran; Steven P. DenBaars, Editor(s)

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