The Lightologist

Efficacy tells you how much light a source produces for every watt it consumes. It is the most honest performance indicator in lighting — and the one most often ignored.

For a century, we bought light by the watt. Then LED arrived and made that habit obsolete — but the habit remained. Here is why it matters and what to use instead.

Lumens measure the quantity of light a source produces. They tell you almost nothing about whether that light will make your space feel good. Here is what you actually need to know.

A single overhead source flooding a room is not lighting design — it is illumination without intention. Here is the layered approach that separates designed spaces from merely lit ones.

In most projects, lighting is decided after the furniture. This single habit costs clients money, compromises spaces, and produces results everyone is slightly disappointed by.

Every artificial light source ever made has been trying to replicate one thing — and none has fully succeeded. Here is what that means for your projects.

You can only see 0.0035% of the light that exists. What lives outside that range affects your spaces, your materials, and your health more than most people realise.

Light is not just brightness. It is electromagnetic energy — and understanding what it actually is changes every decision you make in a space.