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ASTM E1477-98a(2022)

Current Reaffirmation

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

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

1.3 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 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.

SDO ASTM: ASTM International
Document Number E1477
Publication Date Oct. 1, 2022
Language en - English
Page Count 2
Revision Level 98a(2022)
Supercedes
Committee E12.02
Publish Date Document Id Type View
June 1, 2017 E1477-98AR17E01 Revision
Dec. 10, 1998 E1477-98A Revision
Oct. 1, 2022 E1477-98AR22 Reaffirmation
June 1, 2017 E1477-98AR17 Reaffirmation
May 1, 2013 E1477-98AR13 Reaffirmation
June 1, 2008 E1477-98AR08 Reaffirmation
July 10, 2003 E1477-98AR03 Reaffirmation