Any Color， As Long As It’s White – Could TM-30 Be the Unambiguous Color-Quality Metric We Need？

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　　固態照明的到來使普通消費者在照明的鑒賞家。人們很快意識到，有更多的選擇，作出正確的決定是至關重要的-無論是國內情緒照明，和平和生產性的辦公照明，照明關鍵任務，如手術，或顯示商品在其最好的。

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　　一切都是如此簡單，包括公認的指標燈性能。多年來，照明行業一直使用的顏色渲染指數（CRI）作為一個簡單的表達的平均保真度與一組標準的顏色樣本渲染。樣本集可能包括多達14種顏色，包括中等色度的粉彩色調，飽和紅，黃，綠，藍的顏色，和標準化的膚色。

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　　After determining the Correlated Color Temperature （CCT） of the light source to be tested， a reference source of the same CCT is calculated and the color samples are then illuminated by the test source and the reference source. The coordinates of the illuminated colors in the CIE Y-U-V color space are then determined， and the distance between the pairs of coordinates for each sample （Ei） is calculated and used to generate a set of results （Ri） that express the fidelity for each sample. The arithmetic mean of these values gives the CRI of the test source.

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　　As a straightforward metric that is relatively easy to calculate and easy to understand by experts and consumers alike， CRI has been the favored industry yardstick for many years. It has been adequate for use with incandescent lighting， which has afforded few opportunities for manufacturers to artificially adjust the characteristics of ordinary white （non-colored） light sources. Now， however， the complex processes by which LEDs are made to generate white light gives manufacturers opportunities to offer a wider variety of choices. CRI is unable to describe the difference in color for any specific object， and hence cannot give an understanding of how one source will make objects look compared to another. Moreover， unscrupulous suppliers can take advantage of the simplicity of CRI to engineer a high score for inferior products. The lighting industry and end users need a more robust and less ambiguous metric to describe the color quality of white LEDs

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