Light Reflectance Value Testing

0 100 the a value redness or greenness 100 green.

Light reflectance value testing.

This outlined a need for certain surfaces and features to contrast visually with their environment. The measurement is most commonly used by design professionals such as architectural color consultants architects environmental graphic designers and interior designers. Where it is necessary to achieve sufficient luminance contrast between building elements this can usually be achieved by using very dark or very light materials. Solar light s materials testing lab offers a variety of reflectance tests.

With our visible light reflectance test service we may use any number of color coordinate systems the primary being the cie l a b system. The luminance contrast assessment tool lcat is suitable for comparing light reflectance values lrv also referred to as luminance reflective values to see if compliance can be achieved. Hold the meter about 300mm from the wall facing away from the wall and record the value then repeat with the lightmeter facing the wall and record the value. Accurate lrv data for building regulation compliance using a state of the art cromocon lrv meter we can provide accurate light reflectance value lrv data for any porcel thin porcelain tile.

The l value indicates the level of light dark. An optical device called intergrating sphere is used to measure the light reflected by the test sample. 1 1 this test method covers the measurement of light reflectance value lrv and visually small color difference between pieces of glazed or unglazed ceramic tile using any spectrophotometer that meets the requirements specified in the test method. Light reflectance value lrv is another measure similar to reflectance commonly used by paint manufacturers and interior designers.

This publication is primarily centered on requirements used to assist the disabled including the visually impaired. The lrv scale runs from 0 which is a perfectly absorbing black up to 100 which is a perfectly reflective white. It is defined in bs 8300 2009 a1 2010 as the total quantity of visible and useable light reflected by a surface in all directions and at all wavelengths when illuminated by a light source. Shown below is the interior of the integrating sphere.

Light reflectance value lrv testing for areas where people with visual impairment may be present light reflectance values are important for ensuring noticeable differentiation between materials. Light reflectance value testing in 2013 access to and use of buildings was published within the building regulations. For daylight reflectance test the instrument produces monochromatic light in the wavelength range of 380 nm 780 nm at every 5 nm interval.