Optics, materials and the value of a luminaire

A Louis Poulsen pendant can cost ten times a mass-produced fixture of the same shape. The question every client asks: where does that difference lie — and when is it worth it?

1. You are not buying the fixture, you are buying the light it creates

The first thing people look at is the shape. But what has kept European lighting houses alive for centuries is not shape — it is how they handle light. Louis Poulsen's PH5, born in 1958, has a three-layer shade calculated so the human eye never sees the source directly, from any angle. The light passes through the reflecting layers, becoming soft, glare-free, casting no harsh shadow on the face of the person seated below.

A copy reproduces the shape, but not the optical curves. The result is two fixtures that look alike in a photo, yet create two completely different atmospheres at your family's dinner.

A cheap fixture lights the room. A good fixture shapes the emotions of those who live in it.

2. Colour rendering — what you can't see in the catalogue

Brands like Occhio or Davide Groppi use LEDs with a colour rendering index of CRI 95–98, meaning skin, wood and fabric under the light look almost as they do in daylight. Ordinary fixtures stop at CRI 80: bright enough, but skin turns grey, walnut loses its warmth, the painting on the wall shifts tone. For a villa that has invested billions in materials and interiors, low-CRI light is like watching an expensive film on a cheap screen.

3. Longevity guaranteed by signature, not by word of mouth

Vibia offers a 4-year warranty to global standards. Many architectural brands like Delta Light commit to supplying replacement parts a decade after production ends. This matters more than people think: a good lighting installation lives with the house for 15–20 years. An unbranded fixture whose driver fails after three years usually has no replacement part — you have to chisel the ceiling, replace the whole unit, breaking the original design.

4. When do you not need expensive fixtures?

The honest answer from an independent design studio: not every location needs them. The principle we apply for IDA's clients — invest in the points where light touches people: the dining table, the living room, the bedside, the places where the eye sees the fixture and the skin feels the light. Service corridors, storage, the back yard can perfectly well use standard-grade fixtures. A good lighting design is not the list with the most expensive fixtures, but the one that allocates the budget to the right places.

That is why IDA Lighting works in sequence: design first, choose fixtures after. When the design has determined which spot deserves a Flos and which only needs a good downlight, your investment is no longer a cost — it is something you see every evening, for twenty years.