No. 01 „Lighting with Artificial Light"
ISBN 978-3-926 193-39-1
64pages
DIN A4
Only as PDF!
Index
No. 01 „Lighting with Artificial Light"
- The medium of light
- From nature's light ... to artificial lighting
- The physics of light
- The language of lighting technology
- Quality features in lighting
- Lighting level – Maintained illuminance and luminance
- Glare limitation – Direct glare
- Glare limitation – Reflected glare
- Harmonious distribution of brightness
- Direction of light and modelling
- Light colour
- Colour rendering
- Light generation by thermal radiators, discharge lamps and LEDs
- Overview of lamps
- Luminaires – General requirements and lighting characteristics
- Luminaires – Electrical characteristics, ballasts
- Luminaires – Operating devices, regulation, control, BUS systems
- Review of luminaires
- Lighting planning
- Measuring lighting systems
- Lighting costs
- Energy-efficient lighting
- Lighting and the environment
Extract
Guaranteeing correct colour perception under artificial light forms a very important part of the lighting designer's brief. The appearance of coloured objects is affected by the interaction between the colour – i.e. the spectral reflectance – of the objects we see and the spectral composition of the light illuminating them.
In everyday life, we come across surface colours which can differ in appearance depending on how they are illuminated but which we recognize for what they are thanks to "stored visual standards" that are independent of lighting.
For example, we have a stored impression of the colour of human skin in daylight. Where artificial lighting lacks a particular spectral colour or exaggerates certain colours in its spectrum (as is the case with incandescent lamps), skin seen under it may appear a different colour but will still look "natural" because of empirical compensation. For coloured materials for which no "empirical standards" exist, however, colour perception can vary widely.
The effect a light source has on the appearance of coloured objects is described by its colour rendering properties. These are grouped into grades based on the “general colour rendering index” Ra. The colour rendering index indicates how closely the colour of an object matches its appearance under the relevant light source.
