As an illumination supplier who’s spent 18 years working with architects, office managers, and retail fit-out teams, I’ve heard every excuse for cutting daylighting from a design: “It’s unpredictable,” “We can’t control glare,” “It’s hard to spec consistently.” But in that time, I’ve also seen first-hand what happens when daylight is woven intentionally into a lighting plan—not just as an afterthought, but as a core component. Last year, I worked on a 12,000-square-foot open office space where the design team tried to stick to all artificial LED lights, only adding small “daylight mimicking” fixtures as an extra. Three months in, employees complained of headaches, and the building’s energy bill was 22% higher than the adjacent office across the street. When we reworked the plan to pair south-facing glazing with our dynamic artificial lighting that syncs to natural light levels, the difference was immediate. That’s the thing about daylighting in illumination design: it’s not a trend—it’s a high-performance, science-backed tool that delivers benefits for people, buildings, and the bottom line. Illumination
Let’s start with the biggest, most underrated benefit: human health and productivity. Most of us spend 90% of our time indoors, according to the World Health Organization, and the lack of natural light in many commercial and residential spaces is a quiet public health issue. Our circadian rhythms aren’t fooled by artificial light—our bodies need the blue light spectrum present in sunlight to regulate cortisol (the alertness hormone) and melatonin (the sleep hormone). When daylight is properly integrated, it cuts down on eye strain, a top complaint from office workers. I remember a retail client in downtown Chicago that switched their backroom from fluorescent lights to a mix of daylight and low-profile artificial task lighting. Their stockroom staff reported a 30% drop in eye fatigue over six months, and their error rate for picking orders fell by 12%. That’s not anecdote—studies from the American Society of Interior Designers (ASID) back this up: daylight exposure reduces symptoms of digital eye strain by up to 28% because it has a broader spectrum that’s easier on the eyes.
But it’s not just eye strain. Poor indoor lighting tied to lack of daylight is linked to seasonal affective disorder (SAD), anxiety, and even reduced cognitive function. A 2021 study from the University of California, Berkeley, tracked 1,800 office workers and found that those with access to daylight scored 15% higher on cognitive tests related to problem-solving and focus, and reported 20% less stress than coworkers in windowless spaces. For schools, this is a game-changer: I worked with a elementary school in Phoenix last year that added clerestory windows and light shelves to their classrooms. Teachers noted a 10% improvement in test scores for math and reading over two school years, and absenteeism due to illness fell by 7%. Kids aren’t the only ones affected—hospitals with patient rooms that have access to natural light have shorter recovery times, according to a 2019 study in the Journal of Clinical Nursing. That’s a direct benefit for healthcare facilities, where reducing length of stay translates to lower costs for both providers and patients.
Next, energy efficiency, which is what draws most building managers to daylighting in the first place—and for good reason. Traditional artificial lighting accounts for roughly 15% of global electricity use, per the International Energy Agency (IEA). When daylight is used to supplement or even replace artificial lighting during the day, that load drops sharply. Let’s do the math: a standard 40-watt fluorescent tube runs for 8 hours a day uses 0.32 kWh, while a 100-watt incandescent is 0.8 kWh. If a space gets 4 hours of bright daylight, you can cut that artificial lighting load in half. For a 10,000-square-foot office with 100 light fixtures, that’s 50 fixtures running less during the day, adding up to thousands of dollars in annual energy savings. I had a warehouse client in Dallas who switched from all high-pressure sodium lights to a daylight-dimming system we install. Their lighting-related energy bill went down 35% in the first year, and the payback period was just 18 months. What’s more, modern daylighting systems work with artificial lights, not against them: our fixtures have sensors that adjust brightness and color temperature to match the natural light outside, so when daylight fades, the artificial lights ramp up seamlessly. No harsh transitions, no wasted energy—just consistent, comfortable lighting all day.
There’s also a less talked-about benefit of daylighting: aesthetic flexibility and tenant satisfaction. Tenants, whether they’re office workers, retail shoppers, or hotel guests, prefer spaces that feel connected to the outdoors. A 2022 survey by the National Association of Home Builders found that 78% of commercial tenants are willing to pay a 10% premium for office or retail space with large windows and access to natural light. For retailers, this translates to longer customer stays and higher sales. I worked with a boutique clothing store in Brooklyn that replaced their all-interior track lighting with a mix of skylights and adjustable task lights. Customers spent an average of 18 minutes longer in the store, and sales went up 24% in the first quarter after the remodel. Why? Because natural light makes products look better—colors are truer, textures are more visible, so shoppers can see items as they would in natural outdoor light. For hotels, guest satisfaction scores jump when rooms have access to daylight. A 2020 study from the Hospitality Research Journal found that hotel rooms with windows had a 12% higher guest satisfaction rating than windowless interior rooms, leading to repeat bookings and better online reviews.
Now, it’s important to note that daylighting isn’t just “putting in a window.” Good illumination design with daylight requires balance—too much daylight causes glare, which is uncomfortable and can even damage products like art or textiles. That’s where our team comes in. We don’t just sell lights; we work with architects and designers to integrate daylighting solutions that solve common pain points. For example, light shelves are a simple but effective tool: they’re horizontal surfaces mounted on the exterior of windows that bounce daylight deeper into a space, while blocking direct sun from hitting the eyes. We also specify anti-glare coatings for windows, automated blinds that adjust based on sunlight intensity, and dynamic artificial lights that complement natural light instead of fighting it. Last year, a museum client reached out because their new modern art wing had too much direct sunlight fading their paintings. We worked with their design team to add UV-filtering window film paired with our dimmable LED track lights that only activate when daylight is low. The result? The art is protected, visitors get the benefit of natural light, and the lighting energy use is 40% lower than the previous space.
Another long-term benefit is building resilience and compliance. More and more cities are adding green building codes that prioritize daylight access. Places like New York City, San Francisco, and Seattle have requirements for new commercial buildings to have a certain percentage of space with access to natural light, as part of their energy efficiency and public health rules. When you design with daylighting from the start, you don’t have to retroactively update to meet these codes. It also adds to green building certifications like LEED, BREEAM, and WELL, which are increasingly important for building owners looking to attract tenants and investors. A 2021 report from the U.S. Green Building Council found that LEED-certified buildings have a 10% higher resale value and lower operating costs than non-certified buildings, and daylighting is a key credit in multiple certification systems. For owners, that means their building is more valuable and more competitive in a crowded market.
I know there’s still skepticism. Some designers worry that daylighting is too dependent on weather—overcast days mean less light, sunny days mean too much. But modern solutions have solved that. Our daylight harvesting systems, for example, use photosensors that adjust artificial light levels based on how much natural light is present, even on cloudy days. We’ve had systems in place for over 10 years in spaces in Seattle, which gets less than 150 sunny days a year, and they consistently deliver 25-30% energy savings. It’s not about replacing artificial light—it’s about working with daylight as a free, high-quality resource. When we work with a new client, I always start by asking about their space: where are the windows? What’s the orientation? How do they use the space during the day? Those details let us design a system that’s tailored, not one-size-fits-all.
Let’s circle back to that office project I mentioned at the start. The design team initially wanted to stick to all artificial lights because they thought daylighting was too hard to control. When we reworked the plan, we added clerestory windows along the perimeter, installed our automated dimmable LED fixtures, and added light shelves to block glare from the west-facing sun. Six months later, the building manager told me employee satisfaction scores were up 22%, energy bills were down 24%, and the company had a 10% lower turnover rate that year. That’s not just a win for lighting—it’s a win for the whole business.
If you’re an architect, building manager, retail owner, or designer looking to update your space’s illumination design, daylighting is one of the most impactful changes you can make. It’s not just about saving energy or cutting costs—it’s about creating spaces that are better for people, better for the planet, and better for business. We’ve worked on projects of all sizes, from small 500-square-foot cafes to 50,000-square-foot office campuses, and we can help you design a daylighting solution that fits your needs, budget, and timeline. To learn more about how daylighting can improve your space, get in touch with our team to discuss your project and request a custom assessment.
Electric Hammer References
American Society of Interior Designers. (2021). Daylighting’s Impact on Occupant Wellbeing and Productivity.
International Energy Agency. (2022). Global Lighting Market Report.
Journal of Clinical Nursing. (2019). Natural Light Exposure and Patient Recovery Times in Acute Care Settings.
University of California, Berkeley. (2021). Cognitive Function and Circadian Rhythms in Daylight-Exposed Office Workers.
National Association of Home Builders. (2022). Commercial Tenant Preferences for Natural Light in Work and Retail Spaces.
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