ASTM E1477 - 98a(2013)

    Standard Test Method for Luminous Reflectance Factor of Acoustical Materials by Use of Integrating-Sphere Reflectometers

    Active Standard ASTM E1477 | Developed by Subcommittee: E12.02

    Book of Standards Volume: 06.01


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    Significance and Use

    5.1 Acoustical materials are often used as the entire ceiling of rooms and are therefore an important component of the lighting system. The luminous reflectance of all important components must be known in order to predict the level of illumination that will be obtained.

    5.2 The reflecting properties of a surface are measured relative to those of a standard reflector, the perfect reflecting diffuser, to provide a reflectance factor. The luminous reflectance factor is calculated for a standard illuminant, and a standard observer, for the standard hemispherical (integrating-sphere) geometry of illumination and viewing, in which all reflected radiation from an area of the surface is collected. In this way the reflecting properties of an acoustical material can be represented by a single number measured and calculated under standard conditions.

    5.3 Acoustical materials generally have a non-glossy white or near-white finish. The types of surface cover a wide range from smooth to deeply fissured. Measurement with integrating-sphere reflectometers has been satisfactory although multiple measurements may be required to sample the surface adequately. Instruments with other types of optical measuring systems may be used if it can be demonstrated that they provide equivalent results.

    5.4 The use of this test method for determining the luminous reflectance factor is required by Classification E1264.

    1. Scope

    1.1 This test method covers the measurement of the luminous reflectance factor of acoustical materials for use in predicting the levels of room illumination.

    1.2 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

    E1164 Practice for Obtaining Spectrometric Data for Object-Color Evaluation

    E1264 Classification for Acoustical Ceiling Products

    E1331 Test Method for Reflectance Factor and Color by Spectrophotometry Using Hemispherical Geometry

    E1345 Practice for Reducing the Effect of Variability of Color Measurement by Use of Multiple Measurements

    E1347 Test Method for Color and Color-Difference Measurement by Tristimulus Colorimetry


    ICS Code

    ICS Number Code 17.180.20 (Colours and measurement of light); 91.120.20 (Acoustics in buildings. Sound insulation)

    UNSPSC Code

    UNSPSC Code 41115316(Reflectometers)


    Referencing This Standard

    DOI: 10.1520/E1477-98AR13

    ASTM International is a member of CrossRef.

    Citation Format

    ASTM E1477-98a(2013), Standard Test Method for Luminous Reflectance Factor of Acoustical Materials by Use of Integrating-Sphere Reflectometers, ASTM International, West Conshohocken, PA, 2013, www.astm.org

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