title: White LED compared with other light sources: age-dependent photobiological effects and parameters for evaluation.
abstract: Ergonomic science at work and living places should appraise human factors concerning the photobiological effects of lighting. Thorough knowledge on this subject has been gained in the past; however, few attempts have been made to propose suitable evaluation parameters. The blue light hazard and its influence on melatonin secretion in age-dependent observers is considered in this paper and parameters for its evaluation are proposed. New parameters were applied to analyse the effects of white light-emitting diode (LED) light sources and to compare them with the currently applied light sources. The photobiological effects of light sources with the same illuminance but different spectral power distribution were determined for healthy 4-76-year-old observers. The suitability of new parameters is discussed. Correlated colour temperature, the only parameter currently used to assess photobiological effects, is evaluated and compared to new parameters.
authors.affiliation: a Ponva d.o.o ., Slovenia.
authors.forename: Katja Malovrh
authors.initials: KM
authors.lastname: Rebec
authors.affiliation: b National Institute of Chemistry , Slovenia.
authors.forename: Marta
authors.initials: M
authors.lastname: Klanjšek-Gunde
authors.affiliation: c University of Ljubljana , Slovenia.
authors.forename: Grega
authors.initials: G
authors.lastname: Bizjak
authors.affiliation: c University of Ljubljana , Slovenia.
authors.forename: Matej B
authors.initials: MB
authors.lastname: Kobav
mesh_terms: D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000368:Aged; D002648:Child; D002675:Child, Preschool; D006801:Humans; D008027:Light; D008550:Melatonin / Q000096:biosynthesis*; D008875:Middle Aged; D052817:Phototrophic Processes; D055815:Young Adult
chemical_list: D008550:Melatonin
keywords: LED; blue light hazard; correlated colour temperature (CCT); general lighting; melatonin production; melatonin suppression time; photobiological effects