A method of solving inverse problem for lighting group control and its evaluation by implementation

Shinji Kitagami, Yosuke Kaneko, Akihisa Yasuda, Hisao Koizumi, Takuo Suganuma

Research output: Contribution to journalArticlepeer-review


Lighting occupies not less than 30% of electrical power consumption in a typical office building. Lighting control systems have been proposed as energy-saving to reduce electrical power consumption of lighting by supplying necessary illuminance for necessary locations, combined with illuminance sensors and human presence sensors. However, in the closed-loop control of dimming, abrupt changes of target illuminance by information from human-presence sensors might cause flicker of illuminance, and might thereby decrease the office workers' comfort and productivity. This paper proposes a direct-solution algorithm of an inverse problem for open-loop control of lighting to reduce flicker of illuminance. The proposed algorithm computes the setting pattern of the dimming rate from the target illumination distribution on desks using a light influence matrix derived by the point-by-point method of lighting. In this study, we applied a lighting group control system that adopts this proposed method in an actual office. In this paper, we show that the proposed method is effective by experiments using this system.

Original languageEnglish
JournalIEEJ Transactions on Electronics, Information and Systems
Issue number10
Publication statusPublished - 2012 Jan 1


  • Closed-loop control
  • Light influence matrix
  • Open-loop control
  • Point-by-point method
  • Virtual source of light

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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