Light Reflectance Value Testing

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.

Light reflectance value testing.

The data shows the level of visible and usable light of tile surface so you can be sure it meets the criteria for building regulations. Light reflectance value testing in 2013 access to and use of buildings was published within the building regulations. In architecture light reflectance value lrv is a measure of visible and usable light that is reflected from a surface when illuminated by a light source. Shown below is the interior of the integrating sphere.

The lrv scale runs from 0 which is a perfectly absorbing black up to 100 which is a perfectly reflective white. Divide the latter by the former and the result is an approximate. 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.

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. 0 100 the a value redness or greenness 100 green. This outlined a need for certain surfaces and features to contrast visually with their environment. An optical device called intergrating sphere is used to measure the light reflected by the test sample.

This publication is primarily centered on requirements used to assist the disabled including the visually impaired. 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. The l value indicates the level of light dark. 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.

For daylight reflectance test the instrument produces monochromatic light in the wavelength range of 380 nm 780 nm at every 5 nm interval. 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.