Here's a scene we've watched play out too many times. Months of agonising over the exact oak, the precise vein of the stone, the perfect warm white on the walls. Then the lights go on and everything looks faintly grey, flat and a little sad — like a photocopy of the home you designed. The materials didn't change. The light did. Lighting isn't the finishing touch on good materials; it's the thing that lets you see them at all.

The three numbers on every bulb

Before you buy a single fitting, learn to read three numbers. Most people only know one.

Lumens — how much light

Lumens measure brightness (watts only measure energy use). Too few and the room feels gloomy; too many and it's a showroom. This is the number most people check — and the least interesting one.

Colour temperature (Kelvin) — how warm or cool

Around 2700K is warm and golden, like the old incandescent glow — calm and flattering, right for living rooms and bedrooms. 4000K is a neutral white for kitchens and bathrooms where you want crispness. 6000K and above is cold and bluish — fine for a workshop, harsh for a home. Mixing wildly different temperatures across one open space is the fastest way to make a home feel cheap.

CRI — whether colours look real

This is the number nobody mentions on the showroom floor, and it's the one that decides whether your materials sing.

So what is CRI — and does it matter?

CRI, the Colour Rendering Index, measures how truthfully a light shows colour, against natural daylight, on a scale up to 100. A CRI of 100 is perfect, daylight-grade. The lower the number, the more colours get quietly distorted — reds go muddy, skin looks ill, wood loses its warmth, and that careful paint colour turns grey.

  • 90+ (often labelled Ra90): excellent. Your oak looks like oak, food looks appetising, skin looks healthy. This is what we spec.
  • 80–89: acceptable — the typical “decent” LED. Fine in passageways and utility spaces; a slight flattening you'll notice once you know to look for it.
  • Below 80: poor. Cheap downlights and bargain strips live here. Everything looks a shade off and you can't say why.
A 90+ CRI bulb costs a few dollars more. A grey-looking home, after you spent a fortune on materials, is the expensive option.

Where it matters most

  • Kitchens: you judge whether meat is cooked and produce is fresh by colour. Low CRI literally hides that.
  • Bathrooms and mirrors: skin tone, shaving, makeup — all need honest colour. Pair 90+ CRI with a flattering ~3000–4000K.
  • Anywhere you put nice materials: a feature wall, the stone, the timber. If you spent on the material, light it with light that can actually show it.

A few quiet rules we follow

  • One colour temperature per space. Keep the warmth consistent across an open-plan area; don't let the kitchen glow blue beside a golden living room.
  • Layer the light. A single bright ceiling light flattens everything. Mix ambient, task and accent so the room has depth and shadow.
  • Mind the glare. Recess and shield sources so you see the light, not the bulb. A bare hot point in your eyeline ruins an otherwise lovely room.

The bottom line

Lighting matters more than almost any single furnishing, because it's the medium through which you experience everything else. Get the three numbers right, insist on CRI 90+ where it counts, keep the temperature consistent — and the home you so carefully chose will finally look like itself.