LED lighting beyond colour rendering

March 14, 2017 // By Julien Happich
In a joint position paper, LightingEurope and the International Association of Lighting Designers (IALD) define "Human Centric Lighting" as a form of lighting that goes beyond colour rendering and power efficiency but instead caters for other non-visual effects, including circadian-tuning.

The paper proposes the “Human Centric Lighting” terminology for a lighting system that positively impacts on people’s wellbeing and performance, a lighting system that integrates excellent visual, biological and emotional effects in its design.

Since many people are spending more than 90% of their life indoor, it would be desirable for artificial light to mirror the intensity, timing, colour and dynamics of natural light. Human Centric Lighting should supplement natural daylight and avoid clashing with our circadian cycle. In fact, the paper takes daylight as the reference for good light quality and as the basis for Human Centric Lighting (with appropriate colour quality and comfort, no flicker, glare etc…)

Human Centric Lighting aims at providing the right light for our activities at the right place at the right time. Users, whether they are patients, residents, and staff in hospitals and nursing homes, students and teachers in schools, employees in offices and manufacturing sites and residents in private homes, can all benefit from adequate lighting as per the new terminology.

The paper cites visual benefits including good visibility, visual comfort, safety and orientation; biological benefits including alertness, concentration, cognitive performance and stable sleep-wake cycle; and emotional benefits including improved mood, relaxation and impulse control.