Lighting theory

Quality characteristics of illumination

In exterior and interior lighting, the components of illumination quality are determined by visual performance, visual comfort and the visual atmosphere. Here, visual performance comprises the level of illumination and the limitation of glare. Visual comfort determines colour rendering and a harmonious distribution of brightness. The visual atmosphere is defined by light colour and light direction.

Visual performance
Maintained illuminance
Maintenance factor
Light and shade
Directed illumination
Glare limitation · Reflected glare
The TI method for road lighting
The UGR method for indoor lighting
Colour rendering
Light colour
Light colour of lamps