This post is inspired by “Optimizing Daylighting Performance: Considerations to Maximize Daylighting for Health, Efficiency and Sustainability” by Neall Digert (Kingspan Light + Air / Solatube), and expands on practical implementation considerations for design teams. Click here to read the article.
Optimizing Daylighting Performance: Turning Good Intentions into Reliable Results
Neall Digert’s recent article, “Optimizing Daylighting Performance: Considerations to Maximize Daylighting for Health, Efficiency and Sustainability,” is a helpful reminder that daylighting performance is rarely improved by “adding more glass.” It’s improved by making a series of coordinated design decisions—layout, reflectance, aperture strategy, and product selection—so daylight is delivered where people actually spend time.
At Daylight Specialists, we see this same theme across Midwest projects: the best results come when daylight is treated as a design system, not a single product. Below is a distilled “designer’s view” of the article’s key points, plus how we support architects and design teams in applying them confidently.
Why Performance Matters: It’s About People First
Digert highlights research linking reduced daylight exposure to lower serotonin production and downstream impacts like low mood, fatigue, and reduced productivity. The article also notes documented benefits in workplaces and schools, including improved sleep quality and higher academic performance associated with daylight exposure.
That’s the North Star: deliver daylight that supports occupant wellbeing and performance—while maintaining comfort and visual quality.
Four Design Levers That Shape Daylight Outcomes
1) Space layout
Open plans and carefully placed partitions allow daylight to travel deeper into the plan; atriums, light wells, and clerestories can move daylight to lower levels.
Design takeaway: Daylight should be planned alongside circulation and program adjacencies, not after interiors are fixed.
2) Room depth and aperture strategy
The article calls out a common failure mode: rooms that are too deep relative to window size become underlit, even with “a lot of glass.” When windows aren’t possible—or when the plan pushes beyond effective perimeter daylight—top-lighting solutions (including tubular daylighting devices and architectural skylights) can deliver daylight to interior zones.
Design takeaway: If the plan depth is doing the wrong thing, don’t fight it—supplement it.
3) Surface reflectance
Light finishes are a straightforward multiplier for daylight distribution. Digert emphasizes that light-colored walls, ceilings, and floors reflect more daylight and can reduce reliance on electric lighting.
Design takeaway: Reflectance isn’t “interiors”—it’s daylight performance.
4) Orientation, context, and climate
Daylighting is always site-specific. The article points to orientation and surrounding context as key drivers of daylight access, with east- and west-facing glare risk noted explicitly. It also recommends adapting strategy to climate patterns—for example, prioritizing diffuse light in frequently overcast regions and using shading/glare control in sunnier conditions.
Design takeaway: “More daylight” without glare control often becomes “more blinds,” which becomes “electric lights all day.”
Metrics and expectations: performance needs a target
The article notes that regulations and standards guide minimum lighting requirements, citing IES recommendations (about 300 lux for many commercial/institutional spaces, and higher levels for visually critical tasks). It also references LEED and WELL approaches, including climate-based daylight sufficiency metrics such as Spatial Daylight Autonomy and Annual Sunlight Exposure.
The practical point for designers: define the performance intent early (uniformity, comfort, glare limits, target illumination levels), then verify with daylight modeling rather than relying on rules of thumb. Digert specifically calls out climate-based daylight modeling as a way to assess proposed designs.
Where top-lighting fits: matching the tool to the plan
Digert outlines a range of product approaches—high-performance glazing, translucent systems, light-redirecting technologies—and highlights top-lighting’s ability to bring controlled daylight to areas windows can’t serve.
In our work, top-lighting often becomes the “distribution layer” that makes the rest of the daylight strategy viable:
- Solatube Tubular Daylighting Devices (TDDs) are ideal when you need controlled, diffuse daylight delivered to specific interior zones—corridors, enclosed offices, support spaces, interior classrooms, exam rooms, and other areas that would otherwise be electric-lit all day.
- VELUX commercial skylights are a strong fit when you’re shaping larger volumes—commons, gyms, retail, production areas—where top-lighting is part of the architectural experience and the daylight strategy needs to scale.
- Many high-performing buildings use both: skylights to create big, legible daylight moments, and TDDs to bring daylight to the places that typically get missed.
How Daylight Specialists helps design teams execute the strategy
Architects and designers already understand the theory. Where projects get difficult is coordination: roof structure, ceiling conditions, diffusion, glare control, photometric expectations, and construction realities all intersect.
This is where our consultative approach supports your team:
- Early design assistance to translate goals into aperture strategy (where top-lighting matters, what can stay perimeter-lit, and how to avoid common glare/contrast pitfalls).
- System selection support across Solatube TDDs and VELUX commercial skylights to match program needs, roof/ceiling constraints, and performance intent.
- Coordination and documentation support (details, constraints, constructability input) to reduce late redesigns and RFIs.
- Installation + project management so the design intent survives procurement and field conditions—especially important in retrofit work and fast-track schedules.
- Performance-minded collaboration aligned with modeling results and standard requirements when project teams are targeting LEED/WELL outcomes.
Daylight can do more than brighten a plan—it can improve how a space feels and how people perform in it. If you’re designing a space where comfort, focus, and wellbeing matter, Daylight Specialists can help you implement a top-lighting strategy that fits the architecture and the occupants. Reach out to start a quick design conversation.