BS 8493:2008+A1:2010 - Light reflectance value (LRV) of a surface. Method of test – BSI British Standards

BS 8493:2008+A1:2010

Light reflectance value (LRV) of a surface. Method of test

Status : Current, Under review   Published : November 2008

Format
PDF

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HARDCOPY



BS 8493 specifies the method of test to determine the Light Reflectance Value (LRV) of different surfaces of materials. LRV is the proportion of visible light reflected by a surface compared to the sensitivity to light of the human eye.

BS 8493 applies to:

  • Opaque paint coatings and paint systems, including those that cause extreme angular dependences of reflected light and those that have a surface texture of <2 mm
  • Opaque coverings including those that cause extreme angular dependences of reflected light, and those that have an unyielding texture of <2 mm
  • Opaque coverings with a yielding pile, e.g. carpet
  • Opaque materials, including those that cause extreme angular dependences of reflected light, and those that have a texture of <2 mm, e.g. finished metals
  • Opaque materials coated with non-opaque coatings or coverings, e.g. timber door coated with a woodstain, including those that cause extreme angular dependences of reflected light, and those that have a texture of <2 mm
  • Multi-coloured surfaces
  • Ordinary materials.

The method of test is not suitable for the following surfaces:

  • Thermochromic
  • Photochromic
  • Retroreflecting
  • Fluorescent
  • Phosphorescent
  • Surfaces involving electrical power for light emission
  • Self-luminous characteristics or for free-standing, non-opaque materials, e.g. glass and clear plastic for curved surfaces.

BS 8300 points out that the LRV between two visually adjacent surfaces can help to predict the ability of people who are visually impaired to see a difference. The greater the LRV difference between two visually adjacent surfaces, the more likely that the difference would be identified. Paint manufacturers therefore also need to cater for visually impaired people.

Contents:

Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Apparatus
6 Preparation of test specimens
7 Procedure
8 Test
9 Expression of results
10 Test report
Annexes
Annex A (informative) Comparison between the BS colour code and the LRV of colours within BS 4800
Bibliography


 




Standard NumberBS 8493:2008+A1:2010
TitleLight reflectance value (LRV) of a surface. Method of test
StatusCurrent, Under review
Publication Date30 November 2008
Confirm Date01 May 2015
Normative References(Required to achieve compliance to this standard)CIE 15:2004, CIE 130:1998
Informative References(Provided for Information)BS 8300:2009, BS EN ISO 105-B05, BS 8475, BS 5252, BS 4800
Amended ByAmendment, March 2010
Draft Superseded By09/30203004 DC
DescriptorsCoatings, Handicapped people, Colorimetric characteristics, Contrast (optical), Visually-impaired people, Railway vehicles, Disabled people, Surfaces, Paints, Buildings, Optical measurement, Reflection factor, Buildings open to the public, Aids for the disabled, Design
ICS11.040.70
CommitteeB/559
ISBN978 0 580 67695 6
PublisherBSI
FormatA4
DeliveryYes
Pages22
File Size904 KB
Price£130.00


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