ASTM E811 - 09

    Standard Practice for Measuring Colorimetric Characteristics of Retroreflectors Under Nighttime Conditions

    Active Standard ASTM E811 | Developed by Subcommittee: E12.10

    Book of Standards Volume: 06.01


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    ASTM E811

    Significance and Use

    This practice describes a procedure for measuring the chromaticity of retroreflectors in a nighttime, that is, retroreflective, geometry of illumination and observation. CIE Standard Source A has been chosen to represent a tungsten automobile headlamp. Although the geometry must be specified by the user of this practice, it will, in general, correspond to the relationship between the vehicle headlamp, the retroreflector, and the vehicle driver's eyes. Thus, the chromaticity coordinates determined by the procedures in this practice describe numerically the nighttime appearance of the retroreflector.

    1. Scope

    1.1 This practice describes the instrumental determination of retroreflected chromaticity coordinates of retroreflectors. It includes the techniques used in a photometric range to measure retroreflected (nighttime) chromaticity with either a telecolorimeter or telespectroradiometer.

    1.2 This practice covers the general measurement procedures. Additional requirements for specific tests and specifications are described in Section 7.

    1.3 The description of the geometry used in the nighttime colorimetry of retroreflectors is described in Practice E808 and the methods for calculation of chromaticity are contained in Practice E308.

    1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.


    2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

    ASTM Standards

    E284 Terminology of Appearance

    E308 Practice for Computing the Colors of Objects by Using the CIE System

    E691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method

    E808 Practice for Describing Retroreflection

    E809 Practice for Measuring Photometric Characteristics of Retroreflectors

    CIE Documents

    CIETechnicalReport54 Retroreflection: Definition and Measurement


    ICS Code

    ICS Number Code 93.080.30 (Road equipment and installations)

    UNSPSC Code

    UNSPSC Code


    DOI: 10.1520/E0811-09

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