During the Guangzhou International Lighting Exhibition (GILE 2026) , deLIGHTed Talks Asia brought together an exceptional group of scientists, clinicians, lighting designers, architects, manufacturers, building professionals and industry leaders. Their backgrounds differed, but they shared one ambition: to accelerate the transition from conventional lighting to Good Light that genuinely improves people's lives. The central question throughout the event was straightforward: Ho

The Good Light Group is pleased to welcome Kevan Shaw as an advisor. Kevan is an internationally respected lighting designer with more than 40 years of experience in architectural, museum and urban lighting, and currently serves as a Director of the International Association of Lighting Designers (IALD). Sunset in Iceland Kevan will strengthen our work particularly in the field of lighting design, helping to further integrate health and wellbeing into design practice. His ext

Daylight saving time gives us longer, brighter evenings, but it can also disrupt our natural body clock. Even weeks after the clocks change, many people still feel more tired, find it harder to fall asleep, or struggle to wake up in the morning. The reason is simple. Our body clock is primarily regulated by light. When the clocks move forward by one hour, our social schedule changes overnight, but our body clock does not. It needs time and the right light signals to adjust. P

A summary of the article by Jan Denneman and Dave Hollingsbee, published in Arc, a magazine for architects and interior designers. For years, the lighting industry has focused on three key goals: functionality, design, and sustainability. We have made remarkable progress in energy efficiency, circular manufacturing, and smarter lighting controls. But there is a fourth dimension that deserves equal attention: sleep, human health and performance. Photo by copernico on Unsplash

We’ve organised our 25th Good Light Group meeting. The topics included: Jan Denneman with the Good Light Group news. Lawrence Lin presents an update on the Good Light Group Asia & more info about the deLIGHTed Talks Asia. Maarten Voorhuis shares his insights into the use of the light-measuring function on the Apple Watch. Photo by Jonatas Daniel on Unsplash Missed the Good Light Group Meeting? Watch the presentions online here: Jan Denneman - Good Light Group news Lawrence

An epidemiological study (Stevenson et al., 2024) with participants from the UK found that people who had more ultraviolet, or UV, light exposure tended to live longer compared to people with less UV exposure. That finding might sound strange, because exposure to UV light – which is part of sunlight – is commonly communicated as a health risk factor. In fact, too much UV exposure can increase the risk of skin cancer. These new findings, however, suggest a more nuanced relatio

We are delighted to welcome ClearLight as a new participant in our Group. At ClearLight, they believe that the way we approach lighting is fundamentally flawed. For decades, lighting has been designed around standards, efficiency, and cost reduction, while the human perspective has largely been overlooked. Good lighting, however, does far more than simply illuminate a space. It affects our biology, our natural rhythms, and our overall wellbeing. It influences how we feel, how

Light is more than something you see. When it enters your eyes, it reaches parts of your brain that regulate your sleep, your mood, your alertness, and your long-term health. This happens every time you step outside, sit under a lamp, or look at a screen, whether you notice it or not. And the pattern of light you live in, bright or dim, day or night, shapes how well your body works. How light shapes your body clock Every cell in your body follows a roughly 24-hour rhythm. Thi

Jeroen Bosch Hospital (JBZ) in Den Bosch, the Netherlands, has reported encouraging early results from a new night-shift system called a “chrono-schedule”. In a pilot study, nurses working under the new system said they felt less exhausted after night shifts, had less difficulty staying awake, and recovered more quickly afterwards. Photo by Amir Arabshahi on Unsplash Instead of working a full night shift, staff worked shorter shifts from 8.00 pm to 4.00 am or from 4.00 am to

Sleep is fundamental to our health, performance, and wellbeing — yet it is increasingly disrupted by our everyday’s actions and the way we design and light our buildings. This CIBSE-approved CPD course explores the science of sleep, our internal body clock, and how integrative lighting design can actively support healthier sleep–wake rhythms. Photo by Gregory Pappas on unsplash Understanding sleep: more than just “switching off” A clear overview of what sleep actually is, bre

Sleep doesn’t start when your head hits the pillow, it begins hours earlier with the signals you send your brain. One of the most important signals is light. To support deep, restful sleep, it’s recommended to keep light levels below 10 lux starting three hours before bedtime. Photo by Giorgio Trovato on Unsplash How Light Affects Your Sleep Your brain uses light to decide whether it’s time to be awake or asleep. Bright light in the evening, especially artificial lighting a

Last week, Jan Denneman had the opportunity to speak at Light + Building in Frankfurt as Chair of the Good Light Group. What continues to strike him is this: we spend around 90% of our time indoors, yet the light around us is fundamentally misaligned with our biology. The impact is not subtle. It shows up in poor sleep, low energy, reduced wellbeing, and long-term health risks. And still, we treat this as normal. The reality is simple. During the day, most indoor environments

We’ve organised our 24th Good Light Group meeting. The topics included: 1. Jan Denneman - Good Light Group news 2. Lawrence Lin – Good Light Group Asia 3. Kevan Shaw – The aging eye Photo by Andres Sanz on Unsplash Missed the Good Light Group Meeting? Watch the presentions online here: Good Light Group news - Jan Denneman The aging eye - Kevan Shaw

Spending time outdoors is ideal, but many of us still spend large portions of the day inside. When natural daylight is limited, optimizing your indoor light environment becomes essential for maintaining energy, focus, and a healthy daily rhythm. These two simple steps can make a big difference. Photo by Surface on Unsplash Step 2: Stay within one meter of a window When you’re indoors, your proximity to natural light matters more than you might think. Light intensity

We are very happy to welcome it doens Lighting to our group! It does Lighting is an independent, qualified, and evidence-led company with nearly 40 years of experience. They get to the root of what light means and how it acts as nutrition for the body’s cells, and they are highly experienced in designing healthy lighting schemes. “I was pleased to accept the invitation to join the Good Light Group as a Scientific Advisor. The group brings together an international cohort of r

In our busy, screen-filled lives, it’s easy to spend most of the day indoors. But making time to step outside, particularly in the morning, can have a huge impact on your overall health and well-being. In fact, scientists recommend spending at least 2 hours outside during the day, with a good portion of that time in the morning if possible. Photo by cal gao on Unsplash The power of morning light Morning sunlight plays a vital role in setting your body’s brain clock, also k

A blog by Ivo Habets “Natural daylight during office hours improves glucose control and whole-body substrate metabolism” The circadian timing system regulates many processes in the human body. While it is best known for controlling our sleep–wake cycle, metabolism also follows a strong daily rhythm. This includes processes such as glucose regulation, insulin sensitivity, and substrate use, which vary across the day in a coordinated manner. The main entrainment signal for the

A blog post by Dr. Aida Farshadi For millions of years, humans lived under the full spectrum of sunlight. Our physiology evolved not just with visible light, but also with near-infrared light (NIR), an invisible wavelength that makes up nearly half of the sun's energy reaching Earth. Photo by Todd Rhines on Unsplash What is near-infrared light and why we're missing it? Near-infrared sits just beyond the red end of the visible spectrum, in the 700–1100 nm wavelength range. Un

SunLED is a Dutch start-up at the forefront of near-infrared light research and its effects on human health and well-being. The near-infrared part of the sunlight spectrum is often missing from our indoor lives; however, it is essential for our bodies. Near-infrared light can penetrate deep into our skin and activate energy production in our cells. It has multiple proven health benefits for the human body, including: Improved mental health - makes you feel more energized, fo

Launch of Good Light Group Asia We are very pleased that Lawrence and his team have taken the initiative to establish Good Light Group Asia. This organization is dedicated to promoting the use of good indoor light. Across Asia, we see a growing awareness of the impact that light and lighting have on health and well-being. This awareness can be seen within the lighting industry, academic institutions, and governments. This is highly relevant. Just like elsewhere in the world,