Evaluation of Metrics of Light emitting diodes in the context of human centric lighting

Semiconductor based LEDs are the central building blocks of solid state luminaires used in a majority of lighting applications today and provide major savings in energy.

Currently, white LEDs/LED chips based luminaires have already reached efficacies above 160 lm/W and projected to increase up to 250 lm/W. Even more performance improvements are expected in the future with RGB(Y/A) white LEDs.

However, together with higher efficacies single LED chip foot-print has also reduced significantly resulting in very bright and small area sources which cause visual discomfort (glare). In general, any form of non-optimal lighting causes strain and fatigue. Thus for human centric lighting, health, comfort and effectiveness are very critical.

Keeping this in focus, the project aims to evaluate the importance of the different performance metrics of luminaires such as efficacy, luminous intensity, (source) luminosity area, glare, color rendering index and the need for adaptation optics in luminaires.