Multispectral mixing scheme for smart LED-based lighting system

Song Bor Chiang*, Ming Chin Chien, Chung-Hao Tien

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

3 Scopus citations


LED cluster is probably the most relevant among the emerging solid-state lighting techniques. Impressive scenarios of a wide range of color quality and luminous efficiency have been obtained, mostly at the condition of constant ambient temperature. This paper removes the constraint in ambient temperature. We present a methodology analogous to a general lens design rule to optimize step-by-step the spectral power distribution of a white-light LED cluster. The scheme enables the users to determine the optimal operation to meet requirements such as light efficiency, color quality, or other figures of merit over a wide range of color temperatures. All main factors influencing the spectral power distribution (SPD) are discussed, alongside the implementation of a pentachromatic R/G/B/A/CW platform suitable for clinic use. The result shows the multispectral cluster can be modulated within the color temperature from 2800K to 8000K in the range ambient temperature (10°C ∼ 100°C) with high color quality scale (CQS > 85 points) and the possibly highest luminous efficiency.

Original languageEnglish
Title of host publicationLight-Emitting Diodes
Subtitle of host publicationMaterials, Devices, and Applications for Solid State Lighting XVI
StatePublished - 5 Mar 2012
EventLight-Emitting Diodes: Materials, Devices, and Applications for Solid State Lighting XVI - San Francisco, CA, United States
Duration: 24 Jan 201226 Jan 2012

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X


ConferenceLight-Emitting Diodes: Materials, Devices, and Applications for Solid State Lighting XVI
Country/TerritoryUnited States
CitySan Francisco, CA


  • chromaticity point
  • Cluster
  • color rendering
  • CQS
  • LEDs mixing optimization
  • lens design
  • luminous efficiency
  • merit function


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