Definition:
Human-centric lighting (HCL) is an approach to lighting that prioritises people’s needs across visual performance, comfort, wellbeing and biology. It includes circadian-supportive lighting but also considers factors such as glare control, colour rendering, brightness balance, contrast for tasks, and the psychological effects of colour temperature.
Why it matters:
Well-designed HCL can improve alertness and mood, reduce eye strain, support healthy sleep–wake cycles, and enhance productivity in schools, offices, healthcare and aged-care environments. It helps bridge the gap between visual standards and health-focused outcomes.
How it works:
HCL typically combines:
- Spectrum: cooler, blue-enriched light for daytime focus; warmer light in the evening for relaxation.
- Intensity & distribution: appropriate illuminance, uniformity and contrast for tasks with low glare (UGR) and good modelling.
- Timing & dynamics: time-of-day profiles (tunable white) and daylight integration.
- Control: sensors and schedules that adapt light to occupancy, daylight and user needs.
Measurement and standards:
For the biological (non-visual) component, projects reference CIE S 026 metrics such as melanopic equivalent daylight illuminance (melanopic EDI). For visual quality, designers consider CRI/TM-30, UGR, CCT, and task illuminance targets from relevant standards. Spectral light dosimeters from PhotoSpec Labs help quantify both circadian-effective light and spectral quality in the field.
Applications:
- Workplaces seeking alertness by day and calmer ambience after hours.
- Healthcare and aged care balancing rest, recovery and night-time safety.
- Education spaces optimising attention and visual comfort.
- Smart buildings that automate light for comfort, efficiency and health.
Related terms: