Data Sheet

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9-3) Reflection Ratio
The reflection ratio is expressed as :
R = Reflectance Factor
white board
x (L
center
/ L
white board
)
L
center
is the luminance measured at center in a white area (R=G =B=1) . L
white board
is the luminance of a standard
white board . Both are measured with equivalent illumination source . The viewing angle shall be no more than 2
degrees .