The key message he is sharing is simple: if we want human-centric lighting to move from concept into engineering practice, we need a shared measurement language.
Lighting is not only about what we see. Light is also a biological signal that helps our bodies understand time of day and regulate our circadian rhythms. Because this process happens subconsciously, we cannot judge its effectiveness simply by looking at a light source or experiencing its brightness.
That is why new metrics matter.
Traditional lighting measures such as illuminance, colour temperature, and lumen output describe visual performance — but they do not tell us how effectively a light environment supports our biological rhythms.
Metrics such as melanopic Equivalent Daylight Illuminance (melanopic EDI) provide a way to quantify the circadian impact of light and translate scientific understanding into practical lighting design.
Rob’s message is a call for the lighting industry to think beyond illumination:
- Measure light at the eye, where our biology receives the signal
- Develop common standards that designers, manufacturers, and consumers can use
- Create lighting environments that support our daily rhythms and long-term health
Artificial light has transformed human life. The next step is ensuring that the light we create works in harmony with human biology.
A future where lighting products communicate not only how bright they are, but also how they support our health, could fundamentally change the way we design and experience spaces.
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