Color and brightness discrimination of white LEDs

Patricia Rizzo, Andrew Bierman, Mark S. Rea

Research output: Contribution to journalConference articlepeer-review

10 Scopus citations


Great strides have recently been made in the development of white light emitting diodes (LEDs), although perceptible variations remain in the color and brightness of nominally identical products. The objective of this study was to examine color and brightness discriminability between different white LEDs when used as illuminants of colored and achromatic objects. A method of successive comparisons was used to assess discriminability rather than the more typical simultaneous (side-by-side) comparisons using a "same-different" response protocol. Three-dimensional "tolerance zones" were developed based upon discriminability in chromaticity (u', v') and luminance when illuminating the colored and achromatic objects. These "tolerance zones" could be used to establish specification tolerances for different lighting applications.

Original languageEnglish
Pages (from-to)235-246
Number of pages12
JournalProceedings of SPIE - The International Society for Optical Engineering
StatePublished - 2002
Externally publishedYes
EventSolid State Lighting II - Seattle, WA, United States
Duration: 9 Jul 200211 Jul 2002


  • Chromaticity
  • Discrimination
  • LED
  • Luminance
  • Tolerance zones
  • White light LED


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