Firelight LED Source: Toward a Balanced Approach to the Performance of Solid-State Lighting for Outdoor Environments

Author

Zukauskas, Andrius ; Vaicekauskas, R. ; Tuzikas, A. ; Petrulis, A. ; Stanikunas, R. ; Svegzda, A. ; Eidikas, P. ; Vitta, P.

Author_Institution

Inst. of Appl. Res., Vilnius Univ., Vilnius, Lithuania

Volume

6

Issue

3

fYear

2014

fDate

41791

Firstpage

1

Lastpage

16

Abstract

We report on a blue-amber (“firelight”) cluster of light-emitting diodes (LEDs) with extra-low correlated color temperature (~1860 K) optimized for outdoor lighting under mesopic conditions. When compared with common white LEDs, the firelight LED cluster shows considerably reduced indexes of melatonin suppression and skyglow, increased retinal illuminance for elderly people, but a reduced performance of perceiving colors, which, however, can be tolerated at mesopic luminance. In comparison with an almost metameric high-pressure sodium lamp, the cluster exhibits a potentially higher luminous efficacy, similar reaction time and detection threshold of luminance contrasts for achromatic targets, and noticeably improved color discrimination characteristics.

Keywords

colour; colour vision; light emitting diodes; lighting; achromatic targets; blue-amber cluster; color discrimination characteristics; detection threshold; elderly people; extra-low correlated color temperature; firelight LED source; light-emitting diodes; luminance contrasts; luminous efficacy; melatonin suppression; mesopic conditions; metameric high-pressure sodium lamp; outdoor environments; perceiving colors; reaction time; retinal illuminance; skyglow; solid-state lighting; Color; Image color analysis; Indexes; Light emitting diodes; Lighting; Phosphors; Light emitting diodes; color discrimination; color rendition; light pollution; outdoor lighting; photophysiology; psychophysics; solid-state lighting;

fLanguage

English

Journal_Title

Photonics Journal, IEEE

Publisher

ieee

ISSN

1943-0655

Type

jour

DOI

10.1109/JPHOT.2014.2319102

Filename

6804694