10/ 2010
BENNING LUXMETER B
15
Table of content
1. Introduction ................................................................................................16
2. Standards for field illuminance (lux) meters ..............................................17
2.1 DIN-standards for field illuminance (lux) meters .......................................18
3. General about illuminance .........................................................................18
3.1 The origin of light .......................................................................................18
3.2 Radiometric and Photometric values
.........................................................18
3.3 Basic photometric definitions .....................................................................18
3.4 Photometric units conversion table
...........................................................19
3.5 FAQ: Illuminance vs Luminance
................................................................19
3.6 What is the CIE V(
λ
) curve?
......................................................................21
3.7 What is cosine correction?
........................................................................22
4. Illuminance measurements ........................................................................23
4.1 When and why to measure illuminance ....................................................23
4.2 Some useful hints to ensure accurate measurements ..............................23
4.3 How to measure average illuminance?
.....................................................24
4.4 Calibration of illumination testers ..............................................................24
5. Standard illumination values
......................................................................25
6. Technical data ...........................................................................................26
6.1 Illuminance probe BENNING Luxmeter Typ B ..........................................26
