During a summer day in Sweden, you can follow the circle of light from dawn to dusk, before stepping into the wonderful sunlight again. The night is barely noticeable. It is no wonder that Scandinavians are obsessed with light. With the blessing of seasons we also have the benefits, and challenges, of the daylight varying with them – and we’ve learned to cherish every moment.
In our part of the world, the number of daylight hours can vary between 6 and 18 hours per day. In the northernmost parts of Scandinavia, at the summer solstice, the sun does not go below the horizon at all – a phenomenon called the midnight sun. On the other hand, at the time of the winter solstice, the sun does not rise at all. At the place from which we origin, the small village of Fagerhult at Lake Vättern in southern Sweden, the contrasts are not that extreme, though there is still a big difference in the length of day and night depending on the season. In June, the sun will not set until after 10 PM only to rise again already at 4 AM. In between, we can enjoy a spectacular twilight.
"It is not wild guessing that our commitment to lighting is a result of the urge to explore our instinctive knowledge of what light means visually, emotionally and biologically." Elin Stjernholm, R&D Manager at Fagerhult
"Part of our DNA"
”The contrasts between the long, dark winter days and the endless and light summer nights are part of our DNA. It is not wild guessing that our commitment to lighting is a result of the urge to explore our instinctive knowledge of what light means visually, emotionally and biologically”, explains Elin Stjernholm, R&D Manager at Fagerhult.
The long, bright summer days have an astonishing effect on most of us. Everyone seems to be happier and more energized. Of course, the circadian rhythm can also be affected, making it a bit harder to sleep. The allure of the daylight is its natural variations. Daylight is living and dynamic – constantly shifting in intensity, brightness and colour. These variations have the power to make us more alert or more relaxed depending on the time of the day. Those insights are the inspiration behind the knowledge used in Fagerhult’s lighting solutions.
”Quality lighting is extremely important for human well-being and affects our health and our mood in a good way. At Fagerhult we have a long tradition of creating lighting solutions for increased well-being and creativity in different human environments, for example schools, offices and healthcare. And this is of course connected to our experiences of the Scandinavian light. In application where needed, we create lighting solutions that complement and strive to mimic the dynamic natural light”, says Elin Stjernholm.
The five different receptors
But how does it work? Actually it is quite simple. Hidden in the depths of the human retina, there’s a network of tiny cells. Five different receptors collect all kind of optical information and each of these “little device” is highly specialized and together they are world class in one simple thing: Gathering and evaluating daylight. How much light does your eyes get and of what quality? As the super sensitive sensors they are, they registers all things light-related and passes the information on to the part of the brain which controls your circadian rhythm.
The lighting information provided by the grid of receptors, transmitted to your brain will affect your body’s production of the sleep hormone melatonin and the stress hormone cortisol. Cortisol production will increase at daytime when light levels are high, keeping you alert. Melatonin production starts when light levels are lower and in the dark, at night-time, telling you that the working day is over and that it is time to unwind and rest.
Finding the perfect combination
With this knowledge we are able to create indoor lighting solutions that everyone can benefit from, helping you to feel energized and perhaps even happier. Basically, it is the lighting level, colour rendering and the colour temperature of the light that is most important. Powerful, bright and cool lighting – like the light outdoors on a sunny day will make you feel focused and alert. Dim, warm lighting will make you feel more relaxed and creates a cozy, warm atmosphere, says Elin Stjernholm.
”If you want to create an efficient work environment you can combine powerful lighting levels and light with a cooler lighting temperature, and you will feel your energy levels rise. If you, on the other hand, want a comfier and homier feeling where people feel relaxed, you should opt for lower lighting levels and a warm light. With today’s lighting technology you can easily choose and change between different feelings and lighting scenarios using the same luminaries.”
Gryning and skymning
This is basically the connection between light, human emotions and energy levels and it also explains why we are so fascinated by the shifts of the day, especially dawns and sunsets.
When visiting the Nordic countries you can experience spectacular twilight periods. Close to the equator twilight only lasts a couple of minutes as the sky changes from daylight to pitch black. But the closer you get to the poles, the longer the twilight period lasts, and depending on season it can take over an hour. That twilight is important to us Scandinavians is also noticeable in the Swedish language. Some cultures use the same word for the morning and the evening light while Swedes always use the two different words for dawn and dusk: ”gryning” and ”skymning”.
The daylight is the inspiration
Actually, to any successful light planner, it is the endless sky, the horizon and the blazing sun that is the optimal lighting scenario. Imagine sitting on a meadow in summertime, slowly watching the day fade away. The light is all around you, it comes from all sides, it is not just directed at you from above.
”Lighting solutions that provides comfortable lighting levels from all directions, preferably with ambient lighting from ceilings and walls, is the best way of mimicking natural daylight, telling your eyes and your brain, that the world – and you – are doing just fine. It’s as simple, and complicated, as that!”
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The Evolution of Retail Experience: Insights from Professor Laura Ugolini – Part One
Every era creates its own version of the ideal shop. In Victorian Britain, abundance mattered. Shop windows were packed tightly with goods, projecting prosperity and variety onto busy high streets. By the interwar years, modernity had become the aspiration: cleaner lines, brighter interiors, electric lighting and carefully staged displays signalled that a retailer was progressive and in touch with contemporary life. The pressures facing retail today – new technologies, changing customer habits, shifting expectations around experience and convenience – are not entirely new. Retail has always evolved in response to social, cultural and technological change. Long before the arrival of online shopping, retailers were experimenting with how architecture, display, atmosphere and service could influence behaviour. We spoke with Professor Laura Ugolini, Director of the University of Wolverhampton’s Centre for the History of Retailing and Distribution (CHORD), to chart this history of retail stores and the role of lighting with in it. The Theatre of the Early Shopfront The instinct to attract attention is far older than the modern high street. Retailers in medieval markets and Georgian streets already understood the importance of presentation, spectacle and visibility. Yet the nineteenth century transformed what shops could physically become. Advances in manufacturing made large plate-glass windows more affordable and widely available, allowing retailers to create bigger and more ambitious displays. According to Laura, Victorian window displays often appear cluttered to modern eyes, with goods “almost crammed into the shop to give an impression of abundance.” When Lighting Became Part of Modern Retail Lighting has long shaped the retail experience, even before electricity became widespread. Gas lighting illuminated nineteenth-century shopfronts and allowed stores to extend trading hours, particularly in winter. Yet the interwar period marked a significant shift in how lighting was discussed and marketed. “Modernity was very much associated with lighting. The cinemas, dance halls, and the city centre were all portrayed as being very bright in that period.” Electric lighting became a visible symbol of progress. Retailers used brightness to communicate cleanliness, efficiency and fashionability. Stores that embraced electric lighting presented themselves as contemporary businesses aligned with changing tastes and lifestyles. “There seems to be this association with being modern, with being up to date. They make comparisons with dark and dingy interiors.” Trade publications of the interwar period increasingly discussed lighting as part of the wider modernisation of retail interiors, alongside shop fittings, display design and window presentation. One interwar menswear article argued that “the modern man’s shop must be bright”, contrasting contemporary retail environments with the “gloomy” and poorly organised outfitter shops of earlier decades. At Walter Scott’s menswear premises in Regent Street, “dust proof fixtures and tubular lighting” were promoted as signs of a modern retail design. While display had long been key to retail, interwar department stores increasingly integrated it throughout the entire shopping environment. One article describing the Simpson store in Piccadilly states that space was devoted to “selling through display”, with furniture, fittings and lighting all contributing to the overall customer experience. Even then, retailers balanced aesthetics with practicality. Electricity remained relatively expensive during the interwar years, meaning natural light still played an important role. Skylights, large windows and glazed façades were often combined with electric lighting to reduce costs while maintaining bright interiors. Markets, Spectacle and Entertainment While department stores projected refinement and sophistication, Britain’s markets developed their own highly theatrical retail culture. Laura points to photographs of 1930s markets, where traders used electric lighting to illuminate stalls and attract crowds. The Saturday night market became both a commercial and social event. “It was often a spectacle as well as just somewhere you went to buy your items. People went for entertainment as well as just to buy things.” The Bolton Worktown photograph, shown below, of a brightly lit shoe stall captures this atmosphere particularly well. Electric lamps flood the stall with light while customers gather closely around the display, demonstrating how illumination could help to create drama, visibility and energy within crowded public spaces. These markets reveal an important point about retail history: experiential retail is not a recent invention. Long before contemporary flagship stores and immersive brand environments, retailers were already using atmosphere, performance and sensory appeal to attract visitors. Shoe Stall, 1937. Humphrey Spender. © Bolton Museum The Department Store Revolution If markets brought energy and spectacle, department stores introduced a new kind of controlled retail environment. By the late nineteenth century, stores such as Harrods, Selfridges and John Lewis allowed customers to browse freely without the pressure to purchase immediately. Cafeterias, reading rooms, hairdressers and rest facilities encouraged visitors to spend extended periods inside. “I would suggest that that kind of experience of actually just browsing, shopping, wandering around and just looking is probably something we associate with department stores in the nineteenth century,” This represented a major cultural shift. Earlier forms of shopping were often highly transactional, involving direct interaction between customer and shopkeeper. Department stores softened this exchange and made browsing itself a leisure activity. The development of customer amenities also changed who retail spaces were designed for. Many department stores actively targeted female shoppers, presenting themselves as respectable and relatively safe urban environments. “Department stores often marketed themselves as a shop aimed specifically at female customers. Somewhere where women could actually wander around in relative safety.” The design of these interiors reinforced that sense of reassurance and comfort. Bright, ordered environments, visible circulation routes and carefully controlled displays all contributed to a more welcoming retail experience. Standardisation and Aspiration As the twentieth century progressed, chain retailers began refining another retail strategy: consistency. Brands such as Marks & Spencer created standardised interiors and displays across multiple locations, helping customers recognise the brand experience wherever they shopped. Laura points to menswear chains, such as Burton, that used fittings and fixtures designed to resemble bespoke tailoring establishments, despite selling mass-produced suits at accessible prices. “It actually felt as if you were entering a bespoke tailor,” This blending of aspiration and accessibility became central to twentieth-century retailing. The environment itself communicated value, trust and identity. An article on Elliotts of Reading described a modernised shopfront as possessing “quiet but compelling attraction”, suggesting retailers increasingly understood that atmosphere and identity could influence customer perception before any interaction took place. That connection between atmosphere and perception continues today. Whether through lighting, materials, layout or display, retail environments still shape how customers interpret brands long before a purchase is made. The Foundations of Modern Retail By the interwar period, retailers were already thinking carefully about how lighting, display, materials and layout influenced perception and behaviour. Many of the themes shaping retail design today – atmosphere, identity, experience and customer comfort – were already emerging nearly a century ago. In part two, we will look at how retail continued to evolve through the twentieth century – from department stores and chain stores to self-service, convenience shopping, and the modern question of what physical stores can offer that digital retail cannot
Melanopic lux: lighting for education influenced by human biology
Light is essential in our daily lives, influencing our ability to see, overall well-being and performance. In educational environments, lighting quality can significantly impact students' focus, mood, and energy levels. So, how do we know what is the right amount and quality of light for this setting? Traditionally, light has been measured in lux, a unit of measurement for the intensity of light. It's used to measure how much light falls on a surface or the amount of light in a given space. One lux is the amount of light that falls on a surface that is one square meter in area when one lumen of light is spread out evenly. Recent advancements in research have unveiled the importance of melanopic lux, which goes beyond mere visibility. This measures how effectively light stimulates specific eye cells that regulate crucial non-visual functions such as sleep and alertness. In classrooms and lecture theatres, the melanopic ratio has become vital in lighting design, enabling educators to create spaces that support visual tasks and align with students' biological rhythms. In this article, we explore how lighting solutions can align with our biology, and how this helps to create optimum conditions for educational environments. The science of vision and light The human eye is a remarkable organ designed for high-resolution colour vision within a small area (approximately 2 degrees of the visual field) while relying on peripheral vision for motion detection. This dual-function system, shaped by evolution for survival, continues to influence how we perceive and interact with our surroundings. Our eyes are particularly susceptible to green and yellow light, reflecting our evolutionary adaptation to naturally lit environments. In contrast, blue light, which is chief in modern LED lighting, requires higher intensity to be perceived at the same level. Effective lighting design carefully considers brightness, timing, and distribution to support visual clarity and biological functions like mood and alertness. For example, exposure to bright light in the morning helps regulate circadian rhythms, boosting alertness and mitigating the effects of seasonal darkness. This is particularly important in educational environments, such as schools and universities, where lighting impacts mood, focus, and overall performance. Our Organic Response system provides an innovative solution tailored for these spaces. This smart lighting technology automatically optimises light levels, featuring daylight-responsive sensors and advanced occupancy detection, maintaining a balance between natural and artificial light. Doing so supports visual comfort and reduces energy consumption, making it an ideal choice for creating dynamic, efficient, and student-friendly learning environments. To further support students, well-lit spaces with minimal glare are essential for reducing eye strain and maintaining focus during extended study sessions. Adjusting light intensity and colour temperature for different tasks—such as reading, group discussions, or creative activities—enhances light's visual and non-visual effects. By integrating thoughtful lighting strategies like those offered by Organic Response, educational environments can promote healthier, more productive, and engaging learning experiences. Integrative lighting: Supporting health and well-being. Integrative lighting (also referred to as human-centred lighting) combines visual and non-visual benefits (such as emotional effects) to support biological rhythms and psychological well-being. This approach goes beyond traditional lighting solutions by considering how light impacts circadian rhythms and hormonal balance. Light exposure in the morning is critical for suppressing melatonin (the sleep hormone) and increasing cortisol (the alertness hormone). Proper timing helps align students' natural rhythms with school schedules, which often require a lot of focus. Consistent exposure to bright, cool light early in the day can enhance energy levels and cognitive performance. The melanopic ratio compares the spectral composition of a light source with daylight. Using this information, you can determine its melanopic lighting intensity. This enables the design of lighting setups that precisely meet both visual and biological lighting needs. Lighting recommendations for educational spaces Each learning environment has unique lighting needs. Libraries benefit from direct lighting on the floor, paired with ambient lighting on walls and ceilings. Vertical shelf lighting (200-300 lx) makes it easier to browse titles. Lecture halls, on the other hand, require glare-free, comfortable lighting with flexible control, ideally with pre-programmed scenarios. In auditoriums and classrooms, strong vertical lighting is crucial for clear visual communication, especially over greater distances, enhancing facial expressions and engagement. General lighting recommendations apply to all educational spaces. Our solutions meet industry standards, ensuring reading and writing areas maintain 500 lx for effective visual tasks. Using daylight-responsive sensors for luminaire rows can reduce energy consumption while maximising natural light. The number and arrangement of luminaires should be adjusted based on the room's size and function to ensure consistent illumination. The role of dynamic lighting A Double Dynamic lighting system can be a game-changer in educational environments. It allows for intensity and colour temperature adjustments to match the specific needs of activities, from quiet reading sessions to collaborative group work. Fagerhult's distinct approach to lighting means that our design is human-centric; we integrate scientific insight into light and human psychology, creating environments that support academic performance and well-being. Our focus on energy efficiency also means our advanced control systems optimise light usage while minimising energy consumption, contributing to a building’s sustainability goals. The customisable setting and flexible solutions ensure that educational environments can create tailored lighting profiles for different times of the day or specific learning activities. Long-term benefits of melanopic lighting Melanopic lighting, designed to mimic the natural light spectrum, helps regulate the circadian rhythm, which is essential for maintaining focus, energy, and emotional balance. In classrooms and study areas, proper lighting can reduce eye strain, improve sleep patterns, and enhance mood, which are critical for students' mental health and academic performance. By incorporating lighting that aligns with our biological needs, schools and universities can foster healthier, more productive learning environments,. This is particularly important during the winter months when daylight is limited. Whether through advanced tuneable white light systems, designs that maximise daylight, or energy-efficient solutions, we are dedicated to leading the way in lighting innovation for educational environments, delivering brighter futures—one classroom at a time.