Illuminance

Every painted surface is a reflector. A wall doesn't just wear a color — it either returns light to the room or swallows it. Illuminance is the discipline of engineering that return: choosing colors, sheens, and coatings so a space collects and amplifies whatever light it's given. Indoors, that can make a hallway feel twice as generous. Outdoors, it can lift a shadowed north façade or give a fog-wrapped exterior a presence that reads from the street.

• High-LRV paints and finishes — Light Reflectance Value measures the percentage of light a color bounces back. Above 70, walls become reflectors — effectively a second window. We compose with LRV deliberately, pairing reflective bodies with grounded accents so brightness never turns sterile.
• Thoughtful sheen for reflectivity — Sheen is reflectance you apply with a brush. An eggshell wall visibly outperforms flat in a dim room; a satin ceiling becomes a soft diffuser overhead. Each surface gets the sheen its light budget calls for.
• Exterior-safe coatings for sun-rich zones — Amplifying light outdoors means coatings that can take it: UV-stable, fade-resistant systems specified for south and west exposures, so the brightness lasts as long as the finish.

When a surface — inside or out — feels dull, tired, or lifeless. Use Illuminance on interior walls that need a sense of expansion, or exterior walls that would benefit from amplified light reflection and visibility. On the Monterey Bay, where the marine layer spends whole seasons filtering the sun, it's often the difference between a home that endures the fog and one that defies it.

The fog-country discipline

Illuminance is our most-practiced study for a reason: coastal light is cool, gray, and scarce for months at a time. The playbook — warm-based whites, LRV above 65, one sheen step brighter than inland convention — is detailed in our Journal guide to colors that amplify natural light in foggy climates. The fog doesn't have to win.