A study of preferred illuminance and correlated colour temperature for LED office lighting

Rupak Raj Baniya, Eino Tetri, Liisa Halonen

Research output: Contribution to journalArticleScientificpeer-review

8 Citations (Scopus)

Abstract

In order to study the preferred combination of the illuminance level and correlated colour temperature (CCT) and the preferred CCT of different ethnic groups in office lighting, a full-scale experiment was conducted in an office room with a light-emitting diode (LED) luminaires. Fifty-three observers from three different ethnic groups (Asian, European and African) rated nine different preset lighting situations after performing different office activities. The combination of 750 lx with 4000 K was statistically significantly preferred for office lighting. It was also found that the impression of brightness increases with a higher CCT and that people feel more stimulated under a higher CCT compared to a lower CCT. The European group preferred a lit environment under CCT 4000 K for office lighting and with the Asian and African groups the preference between 4000 and 5000 K depends upon illuminance levels.

Original languageEnglish
Pages (from-to)39-47
Number of pages9
JournalLIGHT AND ENGINEERING
Volume23
Issue number3
Publication statusPublished - 1 Jan 2015
MoE publication typeA1 Journal article-refereed

Keywords

  • Correlated colour temperature
  • Illuminance level
  • LED lighting
  • Office lighting

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