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Illuminance Uniformity of Outdoor Sports Lighting

机译：户外运动照明的照度均匀度

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This paper analyzes the illuminance uniformity of 30 outdoornsports fields at various points in their service lives. The study wasnlimited to the fields that employ 1500 W metal halide lamps with anrated life of 3000 hours. The sample was comprised of 12 soccer fields,n14 baseball fields, and 4 softball fields, all of which are owned andnmaintained by municipal parks and recreation departments. Fivenuniformity indices were computed for both measured illuminance andninitial design calculations: maximum to minimum ratio (Max:Min),nmaximum to average ratio (Max:Ave), average to minimum ratio (Ave:nMin), coefficient of variation (CV), and uniformity gradient (UG).nMeasured uniformity was rarely as good as the uniformity predicted bynthe design calculations. The uniformity of the baseball and softballnfields was better with hours-of-use, with infields and outfieldsnexhibiting similar trends. Max:Min, UG, and CV indices, as well as thenilluminance of the transition area between infield and outfield, arensuggested as key evaluation parameters. Group vs. spot lampnreplacement, as-built vs. as-designed, dirt accumulation, and outgassingnare factors that contribute to sports lighting uniformity.
机译：本文分析了30个户外运动场在使用寿命中各个点的照度均匀性。该研究仅限于使用寿命为3000小时的1500 W金属卤化物灯的领域。样本由12个足球场，14个棒球场和4个垒球场组成，所有这些场均由市政公园和娱乐部门拥有和维护。为测量的照度和初始设计计算计算了五个均匀度指数：最大与最小比率（Max：Min），n最大与平均比率（Max：Ave），平均与最小比率（Ave：nMin），变异系数（CV）和均匀度梯度（UG）.n测得的均匀度很少像设计计算所预测的均匀度那么好。棒球场和垒球场的统一性在使用数小时后更好，而内场和外场则呈现出类似的趋势。建议将Max：Min，UG和CV指标以及内场和外场之间的过渡区域的照度作为关键评估参数。组与点光源的替换，已建与已设计的，污垢的积累以及除气效果均有助于运动照明的均匀性。

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