Evaluation of integrated daylighting and electric lighting design projects: Lessons learned from international case studies

Niko Gentile, Eleanor S. Lee, Werner Osterhaus, Sergio Altomonte, Claudia Naves David Amorim, Giovanni Ciampi, Veronica Garcia-Hansen, Marshal Maskarenji, Michelangelo Scorpio, Sergio Sibilio

Research output: Contribution to journalArticlepeer-review


This article presents and discusses the lessons learned from the monitoring of 25 integrated daylighting and electric lighting international case study projects. The case studies consist of real occupied buildings that have been monitored as part of the International Energy Agency (IEA) SHC Task 61/EBC Annex 77 Programme. The general goal of the case studies was to balance lighting energy use with occupants’ visual and non-visual requirements. This was achieved using innovative solutions for daylighting and electric lighting with advanced controls, but also implementing simple and out-of-the-box strategies. The findings suggest that energy demands for lighting can significantly be reduced by combining sensible daylight provision, efficient lighting sources, and advances in controls. Yet, the effective achievement of project goals requires adequate monitoring, fine-tuning, and verification. The findings also suggest that the adoption of “integrative” lighting – that is, lighting systems that address both visual and non-visual responses – is getting increasingly popular. Catering to non-visual requirements will likely drive further innovation in lighting technology. Currently, there is limited investment available for developing daylighting systems for integrative lighting, and the current related electric strategies often come at the risk of energy rebound effects. Overall, providing daylighting and understanding user requirements are fundamental steps towards achieving quality projects, with potential benefits beyond saving energy.
Original languageEnglish
Article number112191
JournalEnergy and Buildings
Publication statusPublished - 2022 Aug 1

Subject classification (UKÄ)

  • Architectural Engineering
  • Building Technologies
  • Applied Psychology
  • Energy Engineering


  • daylighting
  • electric lighting
  • shading
  • lighting control
  • view out
  • non-visual effect of light
  • case studies
  • energy saving
  • integrative lighting
  • monitoring and verification


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