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Fluorescent retroreflective safety materials require different measurement approaches for daytime color, fluorescent contribution, and nighttime retroreflectivity. These properties are related, but they are not interchangeable. Selecting the correct standard, geometry, and instrument begins with identifying which optical question the measurement must answer.

The attached PDF explains how 23 CFR Part 655, ASTM D4956, ASTM E991, and ASTM E2301 apply to fluorescent retroreflective materials. It also compares 45°:0° annular and 0°:45° circumferential geometry, including the measurement capabilities and appropriate applications of the HunterLab ColorFlex® L2 and Agera® L2.

Use this guide to:

  • Distinguish daytime color measurement from fluorescence separation and nighttime retroreflectivity.
  • Understand the importance of physical CIE D65 daylight simulation.
  • Compare annular and circumferential measurement geometry.
  • Select an appropriate measurement instrument and methodology.
  • Establish or transfer a reliable quality-control procedure.

Download the attached PDF below for the complete technical discussion and instrument-selection guidance.

 

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To learn more about Color and Color Science in industrial QC applications, click here: Fundamentals of Color and Appearance

Keywords: Fluorescent highway sign color measurement Fluorescent retroreflective sheeting color measurement ASTM D4956 color measurement ASTM E991 fluorescent color measurement ASTM E2301 fluorescent retroreflective sheeting How to measure fluorescent traffic sign color CIE D65 fluorescent color measurement 45°/0° geometry for retroreflective sheeting 0°/45° geometry for retroreflective sheeting Annular vs circumferential measurement geometry Agera L2 fluorescent color measurement ColorFlex L2 retroreflective sheeting measurement Highway sign color measurement standards Microprismatic retroreflective sheeting measurement Daytime color vs retroreflectivity Fluorescence vs retroreflection CIE chromaticity fluorescent traffic signs Coefficient of retroreflection Ra measurement Retroreflectometer vs spectrophotometer ASTM standards for fluorescent highway signs How is fluorescent highway sign color measured? What ASTM standard is used to measure fluorescent retroreflective sheeting? What is the difference between ASTM D4956, ASTM E991, and ASTM E2301? Why does fluorescent retroreflective sheeting require CIE D65 illumination? What measurement geometry is required for fluorescent highway sign color? What is the difference between 45°/0° and 0°/45° measurement geometry? What is the difference between annular and circumferential geometry? Which spectrophotometer is best for fluorescent retroreflective sheeting? Can Agera L2 measure fluorescent highway sign color? Can ColorFlex L2 measure fluorescent retroreflective sheeting? What is the difference between Agera L2 and ColorFlex L2 for highway sign measurement? Why can microprismatic sheeting produce different color measurements between instruments? Why does sample orientation matter when measuring microprismatic retroreflective sheeting? How does Area of View affect measurement of retroreflective sheeting? What is the difference between daytime color and nighttime retroreflectivity? What is the difference between fluorescence and retroreflection? Can a spectrophotometer measure nighttime retroreflectivity? What instrument measures the coefficient of retroreflection (Rₐ)? When is ASTM E2301 bispectral measurement required? Can Agera L2 or ColorFlex L2 perform ASTM E2301 measurements?

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