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Light Reflectance  Natural Finish
  Printable version
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.
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Test report number
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156240 Report of color analysis1 |
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Test date
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February 24, 2006 |
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Project
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Color evaluation: ASTM E1477-98a |
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Sampe ID
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Average Luminous Reflectance Factor 2 |
Light
Reflectance 3 |
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CTL ID
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Client ID
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Material
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CIE Y
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1518402-A
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FAPS0213
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Acoustical Plaster Tile
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79.2
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0.79
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1518402-A
Repeat
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FAPS0213
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Acoustical Plaster Tile
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79.1
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0.79
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1518402-B
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FAPS0213
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Acoustical Plaster Tile
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78.2
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0.78
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1518402-B
Repeat
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FAPS0213
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Acoustical Plaster Tile
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78.5
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0.78
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FAPS0213
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Acoustical Plaster Tile
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79.0
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0.79
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FAPS0213
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Acoustical Plaster Tile
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79.0
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0.79
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Average = 0.79
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| 1 |
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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.
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| 2 |
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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).”
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| 3 |
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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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