Logo
Login Sign Up
Current Revision

ASTM E811-09(2025)

Standard Practice for Measuring Colorimetric Characteristics of Retroreflectors Under Nighttime Conditions
Best Price Guarantee
Instant

$72.00

2-5 Days

$72.00

SAVE 10%

$129.60


Sub Total (1 Item(s))

$ 0.00

Estimated Shipping

$ 0.00

Total (Pre-Tax)

$ 0.00


or
ASTM International Logo

ASTM E811-09(2025)

Standard Practice for Measuring Colorimetric Characteristics of Retroreflectors Under Nighttime Conditions

PUBLISH DATE 2025
PAGES 8
ASTM E811-09(2025)

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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.

1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

5.1 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.

SDO ASTM: ASTM International
Document Number E811
Publication Date Nov. 1, 2025
Language en - English
Page Count 8
Revision Level 09(2025)
Supercedes
Committee E12.10
Publish Date Document Id Type View
Nov. 1, 2025 E0811-09R25 Revision
June 15, 2020 E0811-09R20E01 Revision
July 1, 2015 E0811-09R15 Revision
Dec. 1, 2009 E0811-09 Revision
Jan. 1, 2001 E0811-95R01 Revision
Jan. 1, 2001 E0811-95 Revision