User manual

01/ 2007

BENNING LUXMETER

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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 of the illuminance probe 26