Happy people need

good light

What we are

The Good Light Group is a non-profit organization operating globally.


The Good Light Group has a legal structure of a foundation and has been registered in The Netherlands in May 2019.


The main objective of the Good Light Group is to stimulate the use of Good Light indoors.


This goal will be reached by communicating the benefits of Good Light to the people, by stimulating collaborations and by promoting knowledge developments on the topic of Good Light.

Why the Good Light Group?

The background: from outdoor to indoor

Modern humans evolved on a rotating planet under a natural light-dark cycle during more than 50 000 years. It is only since the time of industrialization, approximately 250 years ago, that people started to stay indoors more and more. Currently, most people spend more than 90% of their lives indoors.


Indoor light levels are about 50x lower than regular outdoor light intensities and the spectral characteristics (colours) of electric light are completely different from natural light.


Current indoor lighting is in most cases sufficient to see, but it is not appropriate for the optimal functioning of body and brain. This means most people are living in ‘biological darkness’ for about 90% of their lives.

The problem: biological darkness

More than 5 billion people live in ‘biological darkness’ during daytime resulting in sleepiness during the day and difficulty with sleeping during the night. It may result in mood disturbances, problems with concentrating, difficulties with learning and memory and a higher risk of errors, accidents, and health and well-being problems on the long turn.

The solution: Good Light indoors

The solution to biological darkness is the use of Good Light indoors. Good Light has similar beneficial effects as natural light and revitalizes us, energizes us, comforts us, and shows us . To have these effects, Good Light needs to be attractive, optimized, dynamic, and personal


Our mission for 2025 is that 1,000,000 people worldwide know about the beneficial effects of Good Light on the body and brain. We also want to accomplish that 100,000 people worldwide live, work and learn in buildings with Good Light.

Long-term strategy

The Good Light Group will create awareness in society about the beneficial effects of Good Light for body and brain.

The Good Light Group will facilitate global collaborations between knowledge institutes, designers for indoor environments and interested companies and organizations.

The Good Light Group will stimulate the use of Good Light in buildings and promote knowledge development around Good Light.



The Board

The foundation has a board of three members, who are responsible for the strategic plan, organization and daily activities to achieve the objectives. In accordance with the non-profit status, the board members do not get financial compensation for their activities.

The Board members:


Jan Denneman – chairman

  • Jan Denneman

More than 40 years of experience in leading executive roles in innovation, marketing and business development.
Initiated several international consortia, like the Global Lighting Association, Zhaga, the Connected Lighting Alliance, LightingEurope.
President LightingEurope 2013-2017; President Global Lighting Association 2007 – 2017.


Bruno Smets – treasurer and secretary

  • Bruno Smets

More than 30 years of experience in lighting innovation. Was active in the public private partnerships Photonics21 and E2BA (Energy Efficient Buildings Association) in order to drive the market uptake of LED lighting.


Marijke Gordijn – member, scientific advisor

  • Marijke Gordijn

More than 30 years of experience in the field of chronobiology, sleep regulation, chronotherapy and the non-visual effects of light. Founder/ owner of Chrono@Work and guest researcher at the University of Groningen, head of the scientific board of the Dutch Sleep-Wake society and vice president of the Society for Light treatment and Biological Rhythms.

Participants & partners

Participants & partners endorse the vision, objectives and activities of the foundation and are willing to help realizing them.

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Joining us

Please contact the Good Light Group using the contact form, for more information about Good Light and/or if you want to contribute to the Good Light Group.