To quantify the illuminance and energy consumption levels achieved by Increasing the ceiling's light reflectance (LR), ceiling system manufacturer Armstrong World Industries commissioned Brinjac Engineering to conduct two controlled studies. (Illuminance is a measure of the intensity of light on a unit area of a surface.) In the first study, four different room configurations were outfitted with a direct recessed 2X2-foot parabolic troffer and an indirect pendant. One set of rooms was given a 75% reflective ceiling; the others, a 90% reflective ceiling, After measuring work plane illuminance in both sets of rooms, Brinjac found the 0.90 LR ceiling to increase direct lighting levels by just 2-5%; however, indirect lighting levels jumped by almost 22% and offered greater lighting uniformity.
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机译：为了量化通过增加天花板的光反射率（LR）所达到的照度和能耗水平，天花板系统制造商Armstrong World Industries委托Brinjac Engineering进行了两项受控研究。 （照度是对表面单位面积上光强度的度量。）在第一个研究中，四个不同的房间配置配备了直接凹进的2X2英尺抛物线形暗槽和一个间接吊坠。一组房间的反射天花板为75％；另一部分是90％的反射天花板。在测量两组房间的工作平面照度后，Brinjac发现0.90 LR天花板仅将直接照明水平提高了2-5％；但是，间接照明水平跃升了近22％，并提供了更高的照明均匀性。
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