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Research portfolio

Committed to take a lead role within the building industry and qualify decision-making, we have conducted multiple research studies focusing on the impact of daylight and natural ventilation on health and wellbeing as well as how building design can combine a comfortable living space with energy efficiency and a delicate use of resources.

Today, our research portfolio comprises more than 60 projects, studies and papers. These have been conducted in close collaboration between our own research team and some of the leading universities and research institutions across Europe and North-America.

Our research focuses on:

  • The effects of daylight, thermal comfort and indoor air quality on health and wellbeing
  • The effects of daylight/darkness, temperatures and indoor air quality on sleep quality
  • The costs to society of unhealthy building – and in particular the role of daylight and indoor climate
  • How to balance energy efficiency and a healthy indoor climate and with sustainability.  

We believe that a better understanding of how daylight and fresh air affect health and wellbeing is fundamental to designing and building healthy, sustainable homes

says Peter Foldbjerg, Head of Daylight, Energy and Indoor Climate

Latest research
The latest research includes studies of the correlation between daylight and productivity in classrooms across Europe, development of a Circadian House vision, how mental and physical health can benefit from an optimal daily pattern of light and dark exposures:

  • Daylight and academic performance
    Research conducted in collaboration with the UPMC / INSERM (Epidemiology of Allergic and Respiratory Disease (EPAR) Department, IPLESP) in France, examined the correlation between daylight and productivity in classrooms across Europe. One conclusion was that pupils performed way better in maths and logic tests in classrooms with larger windows, a higher percentage of windows facing south and adequate daylight control.

    Another study, conducted at Endrup school in eastern Denmark, showed that pupils' performance increased  when  they were in classrooms with improved daylight conditions and indoor climate.

  • The Circadian House
    The Circadian House is a vision for human-centric and healthy building design. Circadian Houses allow their inhabitants to live in sync with the daily and seasonal cycles of the outdoor environment. Circadian architecture enhances human health and well-being by adjusting the home’s lighting and ventilation following the 24 hour day and night cycle and seasonal changes of day length.
  • The psychological and physiological effect of windows
    A study by the Canadian National Research Council (NRC), looked at how windows and skylights offer benefits to occupants through different physiological and psychological mechanisms. It analysed how our mental and physical health can benefit from an optimal daily pattern of light and dark exposures. If we follow these patterns, e.g. such as an effective use of windows, we can potentially achieve  a healthier living.
  • Measuring the sunlight beam
    A study, conducted together with Loughborough University in England, presents a detailed evaluation of the sunlight potential of spaces, by focusing on the amount of sunlight that can enter a room. The researchers developed a new measure for this calculation called the ‘sunlight beam index’.


Research projects initiated by the VELUX Group between 2006 and 2015


Conference interventions by the VELUX Group detailing results and analyses from the Daylight, Energy and Indoor Climate Knowledge Centre

Research portfolio

Below you find a list of some of the studies and research papers we have published, either by ourselves or in partnership with universities and research centres.  

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