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"What is a Y Brightness? Beta Reflectance Factor? Reflection Coefficient?"

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"What is a Y Brightness? Beta Reflectance Factor? Reflection Coefficient?"

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What is a Y Brightness? Beta Reflectance Factor? Reflection Coefficient?

Posted on Dec 03, 2025 by HunterLab

よくある質問Y輝度/輝度とは何ですか?

よくある質問輝度に対するベータ(ß)反射率または輝度係数とは何ですか?

よくある質問反射係数(0~1)とは何ですか?

ASTM E284 Standard Terminology of Appearanceでは、反射率を次のように定義している:

反射率, n - 同じ幾何学的・分光学的測定条件下で、完全反射拡散板から反射される光束に対する、試料から反射される光束の比率。

材料の明るさを測定するために使用される最も一般的な指標は、CIE Y輝度または輝度です。CIE Y指標は、0(可視スペクトル全体の反射率が0%の完全な黒)から100(可視スペクトル全体の反射率が100%の完全な白)の間でスケーリングされます。

ß (β)反射率または輝度係数」は、Y輝度または輝度と同じで、100の代わりに基準1に対する比率で表されます。

反射係数、可視(0-1)」と呼ばれるもう1つの指標は、ß(ベータ)反射率と同じです。

すべての場合において、計算に使用された照度と観察者の組み合わせは、歴史的にC/2°であったが、D65/10°の下で行われた典型的な白色または中性の材料の測定は、非常に近いものとなる。

代表的な白色について、Y輝度/ベータ反射率と反射率を比較した表です。

Posted in Building Products

What is a Y Brightness? Beta Reflectance Factor? Reflection Coefficient?

Posted on Nov 29, 2023 by HunterLab

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.

Posted in Building Products
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