A minimum luminance factor is the minimum allowable ß (beta) value established for a product, indicating the minimum amount of light that should be reflected by the sample.
Industry Reference Methods
ASTM E991 Standard Practice for Color Measurement of Fluorescent Specimens Using the One-Monochromator Method references reporting in Y, x, y D65/2° or D65/10° and includes references to beta reflectance factor.
BS DIN EN 471 High-visibility warning clothing for professional use. Test methods and requirements describes performance specifications of high visibility garments and accessories or safety clothing, including new and in use color and retroreflection criteria.
FAQ: Beta Reflectance Factor and MSEZ
FAQ: “I have a MiniScan EZ but need to report beta reflectance factor. Can this be done on this sensor?”
The ColorFlex L2 firmware features reporting in Y, x, y color scale for any illuminant/observer combination as standard.
A modification of the firmware, CMR-3105 MSEZ Beta Reflectance Factor, allows for the display of ß, x, y as a color scale and ß as a single index for any illuminant observer combination in MiniScan EZ firmware.
Various CMR-3105 firmware displays on the MiniScan EZ that include Beta reflectance factor.
