Light Reflectance Ultra Finish

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Light reflectance will vary depending on the texture and finish color of the product specified. The report below is based on the Fellert Ultra finish in a white (untinted) color.
Test report number
 401496 Report of color analysis1
Test date
 June 26, 2009
Project
 Color evaluation: ASTM E1477-98a
Sampe ID
 Average Luminous Reflectance Factor 2 Light
Reflectance 3
CTL ID
Client ID
Material
Illuminant
CIE Y
2363101
Ultra Finish Fellert White
Acoustical Plaster
D 65
83.1
0.83
F 2
83.1
0.83
2363101 Repeat
Ultra Finish Fellert White
Acoustical Plaster
D65
82.7
0.83
F 2
82.7
0.83
Average = 0.83
1 Color analysis was performed in general accordance with ASTM E1477-98a, “ASTM E1477-98a (2008) Standard Test Method for Luminous Reflectance Factor of Acoustical Materials by Use of Integrating-Sphere Reflectometers.”

The instrument used for this analysis was an X-Rite SP 68 Sphere Spectrophotometer using the CIE 1964 (10°) standard observer with the specular component included.
2 The average of three measurements taken from different locations on the white side of the submitted sample is reported.

ASTM E1477 defines “luminous reflectance factor” as the “CIE tristimulus value Y for the CIE 1964 (10°) standard observer and CIE standard illuminant D 65 (daylight) or F 2 (cool white fluorescent).”
3 ASTM E1477 does not define or determine “Light Reflectance.” Therefore, it is assumed by the industry that light reflectance is calculated by dividing the measured CIE Y value by 100.
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