"Light: from measurement to perception" by Peter Hanselaer

Seminar by Peter Hanselaer, professor at KU Leuven

Abstract

One of the ambitions of smart lighting design is to create a high "quality of light" at minimal energy consumption. However, defining "quality of light" is not so easy and it includes both non-visual (blue light hazard, human centric lighting, melatonin regulation, . . .) and visual aspects. In this lecture, we will concentrate on some visual aspects of light, in particular on brightness, glare and colour rendering. Classical descriptors such as the CIE Colour Rendering Index CRI and the Unified Glare Rating UGR exist for many years. With the advent of solid state lighting and the vast variety of light spectra involved, the calculation and interpretation of those descriptors has been subject of discussion because they seem to perform unsatisfactory. The low correlation between their values and the perception of the light by the human observer has forced the scientific community to revisit these concepts and to re-establish the relation between the descriptors and
the human experience. In this lecture, the prediction of brightness, the latest methods to calculate glare of a luminaire and the new approaches to determine the colour rendition of a light source from basic photometric and colorimetric measurements will be discussed. Doing calculations, simulations and measurements is fine, but the human observer and his or her visual experience will always be the final judge!

This seminar will be held in english

CV

Peter Hanselaer, professor at KU Leuven, received his PhD in Solid State Physics in 1986. In 1997, he founded the Light&Lighting Laboratory research group. The main research areas are indoor lighting, perception&appearance, optical design and optical metrology. In all these topics, doctoral research is combined with industrial consultancy activities. The group contributed actively to the development of criteria for efficient lighting installations, new colour rendering approaches and glare calculations. Peter is the Editor of CIE Division 1.
Homepage : https://www.kuleuven.be/wieiswie/en/person/00056711