LRV stands for light reflectance value, which is a scale that determines the amount of visible and usable light a color reflects from or absorbs into a painted surface. It is measured as a percentage that ranges from zero for black, which absorbs all light, to 100 for white, which reflects all light. This number can often be found on paint chips or paint samples and is provided by many major paint suppliers, as building and design professionals use it to predict how light or dark a color will appear in a space. LRV is also used to calculate the number and type of light fixtures that are needed to provide proper lighting for interiors.
The Americans with Disability Act Accessibility Guidelines (ADAAG) recommends a 70 percent light reflectance value or higher for those with impaired vision, but this is not a strict requirement.