Most of us do not think about how the light hits our faces in a morning meeting, or how the glow from a computer screen carves shadows under our eyes by midnight. We just turn lamps on and off. But the difference between ordinary light and considered light is not just brightness. It is mood, focus, and sometimes, truth. Professionals who shape light for a living do not rely on memory. They write things down.
For years, I kept a small, grubby notebook in my bag. I was a theatre lighting designer, then later worked on film sets. Every page was crammed with measurements, filter numbers, hand-drawn angles, and one-word impressions: “harsh,” “warm,” “flat.” That notebook was my reference library for every problem I had already solved and every accident that had worked. When I moved into helping businesses design their office and retail lighting, that habit of notation became even more critical. The stakes were not a play’s atmosphere but daily employee comfort and customer behavior. I needed to track what worked in a real estate showroom versus a software startup’s coding pit. This is where systematic notes separate the amateur from the pro. A dedicated resource for this practice is surprisingly rare, which is why I value the compilation at nexillumi lighting notes. It mirrors the disciplined approach I learned the hard way.
The core idea is simple: light is a physical material with properties you can record and repeat. Most people guess. A designer knows.
The Why Before The Watt
You cannot note down a solution if you have not defined the problem. The first question any lighting designer scribbles at the top of a new page is not “what fixture?” It is “what should this person feel or do here?” Should they concentrate deeply for two hours? Should they feel invited to linger near a product? Should they look rested on a video call? The goal dictates everything that follows.
A conference room needs light that minimizes glare on screens but keeps faces clear and engaged. A boutique hotel lobby needs pools of warmth that suggest intimacy, not uniform brightness that feels like a clinic. Writing the intended emotional or behavioral outcome anchors all your technical choices later. It prevents you from getting seduced by a beautiful, expensive lamp that does the wrong thing perfectly.
Quantify The Quality
Light has numbers. Color temperature (measured in Kelvins), CRI (Color Rendering Index), lumens (brightness perception), beam spread. These are your baseline facts. Write them down for every source in the space you are assessing or designing.
But then you must translate numbers into human experience. A 2700K bulb might read as “warm white” on a box. In your notes, you need your own word for it next to the number: “butter” or “incandescent-cozy.” A 4000K light might be “clean” but also “sterile” depending on context. Your notebook builds this personal dictionary over time.
Observe Interaction Over Isolation
A single light source almost never exists alone. Daylight bleeds in from a window. The overhead fluorescents hum alongside your new desk lamp. The neon sign outside casts a red hue on the wall after sunset.
The most important notes capture these interactions—the layered effect of multiple sources mixing together at different times of day.
- Record time-specific observations: “3 PM – west sun overwhelms all task lighting.”
- Note conflicts: “Recessed ceiling spot creates screen glare opposite monitor.”
- Chart spill: “Lamp from adjacent meeting room throws pattern on our back wall.”
- Spotlight successes: “Combination of upright floor lamp + low sconce eliminates shadows for reading.”
- Track material responses: “The polished concrete floor bounces too much glare; need diffuse source.”
- Listen for sound: “The transformer in that LED fixture emits faint buzz at low dim.”
A good lighting note does not describe only light; it describes what happens because of it.
The Tool Is Just The Start
A catalog of fixtures tells you what you can buy. A notebook tells you what you need.
Shopping with defined criteria based on past observation stops wasteful purchases. You will know you need an adjustable-arm lamp with high CRI and a diffuser because your notes show you’ve had problems with shadowy work areas and harsh reflections before.
A Note For Every Body
Light interacts with people differently—age changes our eyesight dramatically.
A setting that feels crisp and energizing to a 25-year-old can feel glaringly uncomfortable to someone at 55 or older due to natural changes in ocular lenses.
In shared spaces like offices or homes, your notes should include comments from users across ages: “Subject A (mid-20s) found it fine; Subject B (mid-Lighting Designer’s Notebook50s) reported eye strain after 30 mins.”
This builds empathy into your design choices and creates solutions that accommodate humans rather than just illuminating empty furniture.