| Popis: |
This chapter explores the relationship between light, illumination and colour with respect to human response, and questions the validity of the current numerical systems of measurement. Mankind has evolved over many, many, thousands of years under daylight; that is light directly from the sun and by reflection. Daylight has a broad, relatively smooth spectral distribution embracing the full colour range of the human visual system. Electric illumination has been available for barely 100 years and has developed considerably from the humble incandescent light bulb through discharge sources and now solid state light emitting devices but its measurement systems are based on a much narrower spectral distribution, agreed internationally in 1924, the CIE Vλ distribution. Systems of colour measurement came much later, but are considered insufficiently accurately for modern light sources. Possible alternatives are considered. It also explores the human response to light and colour with respect to environment design. |
