CRF measurement

The contrast rendering factor CRF is used to label reflected glare on horizontal, glossy surfaces (q.v. chapter 1.2 section "Reflected glare on horizontal visual tasks"). Measurements can be executed using a specialised measuring instrument or image resolution devices. The measuring field corresponds to the particular position and the usual viewing direction of the observer relating to that surface.

Figure 3.76: Viewing angle and reference field for CRF measurement
3.1.3.7.6 Reflectance values
3.1.3.7.8 UGR value

SUBJECT SEARCH

  1. Essential requirements for good lighting
  2. Quality criteria of lighting
  3. General requirements
    1. Maintenance Factor
    2. Light and safety at work
    3. Light and non-visual effects
    4. Light and economy
    5. Light and environment
    6. Lighting design
    7. Lighting measurement
      1. Preconditions
      2. Measuring grid
      3. Measuring plane
      4. Illuminance
      5. Luminance
      6. Reflectance values
      7. CRF measurement
      8. UGR value
      9. Light colour and colour rendering
      10. Luminance of luminaires
      11. Emergency lighting
      12. Safety signs
      13. Recording and evaluation
      14. Repair and maintenance
    8. Emergency lighting
  4. Specific lighting requirements
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