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ASTM E811-95(2001)

Historical Revision

Standard Practice for Measuring Colorimetric Characteristics of Retroreflectors Under Nighttime Conditions

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1.1 This practice describes the instrumental determination of retroreflected chromaticity coordinates of retro- reflectors. 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 Test Method 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.


This practice describes a procedure for measuring the color appearance of retroreflectors as seen under nighttime conditions of illumination and viewing. 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’eyes. Thus, the chromaticity coordinates determined by the procedures in this practice describe numerically the nighttime appearance of the retroreflector.5

SDO ASTM: ASTM International
Document Number E811
Publication Date Jan. 1, 2001
Language en - English
Page Count 7
Revision Level 95(2001)
Supercedes
Committee E12.10
Publish Date Document Id Type View
June 15, 2020 E0811-09R20E01 Revision
Dec. 1, 2009 E0811-09 Revision
Jan. 1, 2001 E0811-95R01 Revision
Jan. 1, 2001 E0811-95 Revision
July 1, 2015 E0811-09R15 Reaffirmation