ASTM E809-08(2013)
Standard Practice for Measuring Photometric Characteristics of Retroreflectors

Standard No.

ASTM E809-08(2013)

Release Date

2008

Published By

American Society for Testing and Materials (ASTM)

Status

Be replaced

Replace By

ASTM E809-21

Latest

ASTM E809-21

Scope

5.1 This practice describes procedures used to measure photometric quantities that relate to the visual perception of retroreflected light. The most significant usage is in the relation to the nighttime vehicle headlamp, retroreflector, and driver's eye geometry. For this reason the CIE Standard Source A is used to represent a tungsten vehicle headlamp and the receptor has the photopic, V (??), spectral responsivity corresponding to the light adapted human eye. Although the geometry must be specified by the user, it will, in general, correspond to the relation between the vehicle headlamp, the retroreflector, and the vehicle driver's eye position.

1.1 This practice describes the general procedures for instrumental measurement of the photometric characteristics of retroreflective materials and retroreflective devices.

1.2 This practice is a comprehensive guide to the photometry of retroreflectors but does not include geometric terms that are described in Practice E808.

1.3 This practice describes the parameters that are required when stating photometric measurements in specific tests and specifications for retroreflectors.

1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.

1.5 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.

ASTM E809-08(2013) Referenced Document

• ASTM E284 Standard Terminology of Appearance
• ASTM E308 Standard Practice for Computing the Colors of Objects by Using the CIE System
• ASTM E808 Standard Practice for Describing Retroreflection

ASTM E809-08(2013) history

• 2021 ASTM E809-21 Standard Practice for Measuring Photometric Characteristics of Retroreflectors
• 2008 ASTM E809-08(2013) Standard Practice for Measuring Photometric Characteristics of Retroreflectors
• 2008 ASTM E809-08 Standard Practice for Measuring Photometric Characteristics of Retroreflectors
• 2002 ASTM E809-02 Standard Practice for Measuring Photometric Characteristics of Retroreflectors
• 1994 ASTM E809-94a(2000) Standard Practice for Measuring Photometric Characteristics of Retroreflectors