Luminance factor β
Luminance factor β
Ratio of the luminance of the surface element in a given direction to that of a perfect reflecting or transmitting diffuser identically illuminated.
- Document
- ISO
- Context
- International Standard
- Origin document
ISO 3864-4:2011(en) Graphical symbols — Safety colours and safety signs — Part 4: Colorimetric and photometric properties of safety sign materials
- Reference Link
- Release