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Proceedings Article

Optimization of multichip white solid state lighting source with four or more LEDs

[+] Author Affiliations
Arturas Zukauskas

Vilnius Univ. (United States)

Felikas Ivanauskas, Rimantas Vaicekauskas

Vilnius Univ. (Lithuania)

Michael S. Shur

Rensselaer Polytechnic Institute (United States)

Remis Gaska

Sensor Electronic Technology, Inc. (United States)

Proc. SPIE 4445, Solid State Lighting and Displays, 148 (December 5, 2001); doi:10.1117/12.450038
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From Conference Volume 4445

  • Solid State Lighting and Displays
  • Ian T. Ferguson; Yoon-Soo Park; Nadarajah Narendran; Steven P. DenBaars
  • San Diego, CA, USA | July 29, 2001

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.

© (2001) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
Citation

Arturas Zukauskas ; Felikas Ivanauskas ; Rimantas Vaicekauskas ; Michael S. Shur and Remis Gaska
"Optimization of multichip white solid state lighting source with four or more LEDs", Proc. SPIE 4445, Solid State Lighting and Displays, 148 (December 5, 2001); doi:10.1117/12.450038; http://dx.doi.org/10.1117/12.450038


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