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Optics Letters

Optics Letters


  • Editor: Xi-Cheng Zhang
  • Vol. 39, Iss. 3 — Feb. 1, 2014
  • pp: 563–566

Phosphor-converted LEDs with low circadian action for outdoor lighting

Akvilė Zabiliūtė, Rimantas Vaicekauskas, Pranciškus Vitta, and Artūras Žukauskas  »View Author Affiliations

Optics Letters, Vol. 39, Issue 3, pp. 563-566 (2014)

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Dichromatic phosphor-converted (pc) light-emitting diodes (LEDs) with low circadian action are proposed for low-luminance photobiologically safe outdoor illumination. The LEDs feature the partial conversion of blue radiation in an orange phosphor with the resulting correlated color temperature in the “firelight” range of 1700–2500 K. The circadian action factor, which is the ratio of the biological efficacy of radiation due to the excitation of intrinsically photosensitive retinal ganglion cells to the mesopic luminous efficacy of radiation, is considerably lower than that of commercial white pc LEDs. The equivalent general color-rendering index estimated with regard to the reduced color-discrimination ability of human vision at low luminances has appropriate values in between those of common white pc LEDs and high-pressure sodium lamp.

© 2014 Optical Society of America

OCIS Codes
(160.2540) Materials : Fluorescent and luminescent materials
(160.5690) Materials : Rare-earth-doped materials
(230.3670) Optical devices : Light-emitting diodes
(330.5380) Vision, color, and visual optics : Physiology
(350.4600) Other areas of optics : Optical engineering

ToC Category:

Original Manuscript: October 25, 2013
Revised Manuscript: December 17, 2013
Manuscript Accepted: December 17, 2013
Published: January 24, 2014

Akvilė Zabiliūtė, Rimantas Vaicekauskas, Pranciškus Vitta, and Artūras Žukauskas, "Phosphor-converted LEDs with low circadian action for outdoor lighting," Opt. Lett. 39, 563-566 (2014)

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