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Together with the  Society for Light, Rhythms, and Circadian  Health (SLRCH) , the  Daylight Academy (DLA) , the  International Association of Lighting Designers  (IALD) and  Luger Research (LR) , we are organising and presenting the ‘deLIGHTed Talks’ lecture series. The lectures are free to attend. SAVE THE DATE: 3 November 2025 (3 PM CET) Register here With insights from IALD, WELL, DLA, and leading researchers, this webinar explores daylight-like conditions indoors and their impact on health, design, and circadian well-being. Join the discussion and gain perspectives from science, practice, and international thought leaders. ​ With an increasing evidence base that properties of daylight can positively affect people’s health and well-being, time has come to address the challenge of daylight-like conditions indoors. At present, many people spend time in spaces lit with electric lighting – at work places and in classrooms. How to design the built environment with appropriate light exposure in mind is the topic of a recent white paper by the the International Association of Lighting Designers (IALD). More info

Good light changes lives. A peer-reviewed study “ Biodynamic lighting effects on the sleep pattern of people with dementia ” reports that good light, either daylight or light that compensates for a lack of daylight, has a substantially positive influence on people with dementia. The results are both humane and practical: better sleep at night, greater alertness by day, and less restlessness overall. What the research found Under good light conditions, residents experienced: Less night-time wandering: average episodes fell from 11 to 5 per night. More night-time rest: time spent lying quietly in bed increased by 77 minutes on average. Fewer daytime naps: episodes fell from 16 to 7 per day. Across two biodynamic lighting conditions (A1, A2) compared with normal lighting (B1, B2), there was a clear decrease in both night-time bed exits and daytime dozing. Photo by Kampus Production How the light was delivered To achieve a therapeutic dose of light, the programme provided 1,000 lux measured vertically at eye level (120 cm). In practice, this was delivered by positioning three Sparckel  luminaires in strategic locations within a larger shared living room with more than 18 residents. The set-up was freestanding and plug-and-play, making it straightforward to apply in real-world care settings.   Why dynamic good light matters Good light is the right light at the right time. Specialised daylight detectors in the eye connect to the part of the brain that houses the biological clock. This clock regulates daily bodily rhythms like sleep, alertness, mood and digestion. These detectors require bright light during the day and dim light in the evening to keep time accurately. This is especially important for people with dementia, who rely even more on a stable biological clock.   ‘We launched a good light pilot in the summer in the living room at Wilhelmina van Sonsbeeck (a nursing home in the Netherlands). During the pilot, we observed that residents slept through the night again, felt fit and active during the day, and were in a better mood; night-time restlessness decreased by about 60%. The extra lighting was appreciated by residents, families and staff alike. The results were astonishing,’ — Engeline Plaggenmarsch, Location Director, IJsselheem   Evidence from everyday care homes Three students conducted complementary research at Zorgboog Helmond and Liessel, studying 48 residents with dementia in small-scale residential settings. Across three observational sub-studies, they found: Sleep–wake cycle:  a significant decrease in daytime sleepiness, with greater daytime alertness and longer night-time sleep. Restlessness:  a significant decrease in non-aggressive physical behaviours such as general restlessness, repetitive actions and aimless wandering. Mood:  a significant reduction in apathy, reflected in improved motivation and engagement. Source: https://sparckel.com/nl/fontys-onderzoek-daglicht-is-gunstig-bij-dementie/ https://sparckel.com/nl/ongezellige-verlichting-zorgt-voor-topsfeer-in-zwols-zorghuis-voor-mensen-met-dementie/

In this episode we’ll be focusing on how to measure light. To guide us through this topic, we’ve invited Hedy Lee from UPRtek, a specialist in spectral measurement devices, which are amazing tools for everyone creating light or seeking hight-quality lighting products. UPRtek is dedicated to helping people explore light and colour through advanced technology. When LED lighting first entered the market, it also brought with it challenges around colour accuracy and light safety. In response, UPRtek developed practical, laboratory-grade spectral measurement devices, making it far easier to assess light quality without relying on complex lab equipment. Join us and discover how to measure good light and why it matters. Listen on Spotify

We are very pleased to announce that Lawrence Lin has joined our board as a new member! Lawrence is an innovative LED & lighting expert, with strong connections in China and across global networks. He has 27 years' experience in the LED and Lighting industry and is the founder & CEO of Lighting Recipe Studio as well as Senior Advisor to Zumtobel Group APAC. He succesfully led the acquisition of LEDVANCE GmBH, formerly SYLVANIA general lighting in USC and OSRAM general lighting global. Lawrence rebuild LEDVANCE into one of the most profitable global lighting player, achieving great results in both consumer and professional applications. “I am very pleased to welcome Lawrence to our Board. His broad experience in lighting, entrepreneurship in promoting human-centric light, and extensive Asian network will be invaluable in advancing the mission of the Good Light Group,” says Jan Denneman, Chair of the Board. Lawrence Lin

Our increasing recognition of the effects of light on circadian clocks and rhythms is fueling exciting applications in agriculture, wildlife conservation, architecture and lighting design, and human lifestyles and treatments for disease. And yet, newcomers to the field may not be familiar with its basic concepts, technical language, and data visualization. To fill this gap, a freely-available online book has just been published by chronobiologists and Good Light Group Science advisors Roelof A. Hut and William J. Schwartz. This online book is intended to provide a “road map,” a first and engaging step towards understanding the essential principles and practice of circadian biology. Three expanded chapters, along with 20 original figures, build on one another, and supplementary (bonus) material is included to support the main text without interrupting its flow. All in all, Hut & Schwartz is an attractive, accessible launching pad for those wishing to acquire a basic and practical knowledge of the field and its expanding literature.

Lighting is often treated like background scenery. Yet it quietly shapes energy use, cognitive performance, sleep quality, and even the credibility of companie’s ESG (Environmental, Social, and Governance) reporting. Human-centric lighting (HCL) turns illumination from a utility into a strategic lever, supporting people and the planet. What is Human-Centric Lighting? Human-centric lighting is an architectural lighting approach that aligns artificial light with human biology, especially to our synchronise our circadian rhythm with the time of the day, rather than focusing only on visual acuity.   Core principles Circadian support: compensates the lack of daylight by adjusting intensity and color temperature to cue alertness by day and relaxation toward evening. Melanopic metrics: Design to sufficient melanopic EDI (Equivalent Daylight Illuminance) to reinforce healthy sleep–wake cycles. Dynamic tunability: Shift from cooler, brighter light in the morning to warmer, dimmer light later in the day. Visual comfort: Reduce glare, harsh contrast, and flicker to cut eye strain and boost focus. User adaptability: Provide task- and age-appropriate control so people can tune light to their needs.   Why HCL Matters for ESG Enivornment: By centering lighting design around people, this approach not only improves individual performance and wellness, but also lays a strong foundation for organizations pursuing sustainable and socially responsible environments. Social: light that supports our circadian rhythms improves alertness, mood, sleep quality, and visual comfort—factors linked to engagement, productivity, and attendance. Governance: investing in human centric lighting demonstrates a transparent and forward-thinking approach to workplace design. Lighting strategies aligned with WELL or LEED certification reflect a commitment to evidence-based health standards. Read the full blog of UPRtek here and discover, among other things, where HCL delivers the greatest benefits.

The third issue of Ciluz magazine is out! Ciluz is a pioneering centre in Chile for research into light and energy, working to make both fields accessible to everyone. The team is deeply committed to raising awareness of the importance of light and energy for the healthy development of people and biodiversity in today’s world. Light is ever-present. It regulates the biological cycles of all living things and is essential to everything we do, at home and at work. When well-designed and properly applied, lighting supports health and wellbeing, boosts performance and uplifts mood. This third issue showcases initiatives that put light at the centre—from health and science to public engagement, art, and sustainability—each guided by a clear mission and objectives. We’re delighted to be featured too: our founder, Jan Denneman, introduces our group and explains how his passion for light led him to launch an outreach project that now reaches a wide international audience, also on social media.   Download magazine

What if lighting were no longer seen merely as an energy issue, but as a key to health, productivity, and well-being? Photo by Copernico P on Unsplash In the recent commentary of Jan Denneman in LED professional Review  (LpR), he explains how the 3-30-300 rule  shows that even a small improvement in human performance and well-being yields far more value than major savings on energy or real estate. Yet the lighting industry still focuses mainly on the €3 for energy, while the largest category, €300 for people, often remains overlooked. The right light, at the right time, can synchronize our biological clock, improve sleep quality, increase energy and concentration, and reduce stress. That’s not only beneficial for people, but also for organizations and society at large.   Read the full commentary in LpR on page 8 here: LEDpro     GoogleDrive      ISSUU

In this episode we’re talking about sleep and light: how daylight sets your body clock, helps you drift off at night, and also why that matters for your skin. Good sleep supports healthier-looking skin, but to sleep well you need enough bright light during the day, especially in the morning, to tell your brain it’s daytime and dim light in the evening so your body can prepare for sleep. Ageing changes this a bit. As we get older, the eye’s lens becomes denser and slightly yellower, so less light reaches the retina. That means we often need more, or brighter, light to keep the body clock synchronised with the time of day. Sit back, listen, learn and enjoy this episode! Listen on spotify

Just checking that one last thing or just one more scroll and suddenly it’s 00.00, your thumb hurts, your eyeballs are twitching, you feel kind of sleepy but you’re just stuck in the scroll. Here’s the thing: You’re not weak-willed. Social media is designed to hijack your attention and  your emotions. Social media works to make you addicted to scrolling. Photo by Kinga Howard on Unsplash But what happens when we actually walk away? Researchers from Stanford and NYU decided to find out. They asked over 35.000 people to deactivate Facebook or Instagram for six weeks , no other interventions, no meditation videos, no 10-step morning routines. Just log off and live life. And here’s what they found: ·       People felt noticeably happier ·       They were less anxious ·       Their depression scores dropped ·       Overall emotional health improved, even just a little So what does this mean for you? If you’ve been feeling more frazzled than fulfilled after scrolling, If you’ve noticed your sleep feels lighter, your mood a little flatter, your evenings more chaotic. It might be less about what’s missing in your routine, and more about what’s still overstimulating your brain before bed. Try this (mini but mighty) experiment: Take two hours before bed and go screen-free, no social, no emails, no doomscrolling. Instead? Try: ·       A bath ·       Reading ·       Watc a relaxing television program (????) ·       Stretchinging or a little yin yoga ·       A brain dump into your journal or drawing ·       Or absolutely nothing  at all You might feel your body unwind faster.You might sleep deeper.You might even wake up happier. No hacks. Just less noise. Your brain (and your bedtime) will thank you!   Source: Stanford University Mollie Eastman

Millions of adults lie awake night after night, and it's not just their health that suffers. Insomnia is now costing the economy billions each year, according to a new study by SEO Economic Research, based on GP diagnoses and data from Statistics Netherlands. Around 1.4 million adults in the Netherlands regularly struggle to get a good night’s sleep. For many, this leads to long-term exhaustion, poor mental wellbeing, and eventually, declining performance at work. Increased screen time, especially in the evenings, is fuelling the rise in sleep deprivation. Another factor is spending too much time indoors, where the level of natural light during daytime is far lower than outside and in the evenings often too bright. Our bodies rely on daylight to keep our internal clocks in sync with the time of day. Without enough exposure to daylight, the brain may struggle to send the right signals for when to feel tired and prepare the body for sleep. Photo by Tim Durgan  on Unsplash   The latest research goes a step further by calculating how insomnia affects earnings, and the findings are striking. Workers suffering from insomnia earn, on average, €800 less each year due to reduced performance or frequent absences. With 1.4 million people affected, this adds up to a staggering €1.1 billion in lost productivity. And it doesn’t stop there. When someone with chronic insomnia ends up on welfare, the economic loss jumps to €45,000 per person each year. Currently, 36,000 people with insomnia receive benefits, resulting in an additional €1.6 billion in lost productivity. Altogether, the total cost to the Dutch 1economy amounts to €2.7 billion annually, and that figure is likely a conservative estimate.   Sleeplessness is more than a personal struggle, it’s an economic issue. Tackling it effectively and educating people on what they can do to improve their sleep could not only help millions feel and function better, but also bring billions back into the economy.   Source: https://nos.nl/artikel/2573289

Proper lighting is not only a necessity, it is one of the most fundamental elements of comfortable living spaces. Tuled Elektronik, wholeheartedly believes in the potential of Good Light Group's "Good Light" philosophy to transform the quality of life, and fully supports this philosophy with their "Human-Nature-Budget friendly'', LED lighting solutions.   We are proud to welcome Tuled Elektronik San. Tic. A.Ş. as the very first representative of our group in Türkiye. We are confident that they will construct a new era in the lighting industry by combining Tuled's innovative and environmentally friendly products with our expertise in raising lighting awareness. Welcome Tuled Elektronik San. Tic. A.Ş. More info