LRV is an acronym for Light Reflectance Value (also referred to as Luminous Reflectance Value).
British Standards Publication, BS 8300:2009 ‘Design of buildings and their approaches to meet the needs of disabled people – Code of practice’ defines LRV as the total quantity of visible light reflected by a surface at all wavelengths and directions when illuminated by a light source. This is important as surfaces that differ sufficiently in LRV can be distinguished from one another by blind and partially sighted people.
The LRV scale is from 0 to 100, with zero assumed to be an absolute pure black and 100 being a perfect white with a perfectly reflective surface. However, because of practical influences in any application, black is always greater than 0 and white never equals 100.
Sourcing the LRV
The LRV is often available from a supplier and all good paint manufacturers will provide these values for all paint colours (usually on the rear of the paint card or fan deck).
Where a supplier doesn’t have an LRV is where we can help. We can test timber, vinyl flooring, carpet, tactile indicators, concrete, stone, painted surfaces, metal surfaces, anything that has a minimum compliance requirement. After testing the materials, we can see if the luminance contrast achieves these minimum requirements.