NEMA LE 5B-1998提供了评估HID工业灯具能效的标准化测试。提供在实验室测试条件下确定灯具效能等级的程序，包括所涉及的视觉任务、灯具放置、颜色和眩光等性能特征、照明维护、开/关电平控制以及镇流器调节灯具功率的能力。当根据EPAct 1992对夹具进行评级时，使用本标准。对于其他用途，请参见NEMA LE 6，这是一个更新的灯具效能标准，取代了LE 5系列。

NEMA LE 5B-1998 provides standardized tests to evaluate energy efficiency of HID industrial luminaires. Provides a procedure for determining the luminaire efficacy ratings under laboratory test conditions, including visual tasks involved, luminaire placement, such performance characteristics as color and glare, lighting maintenance, on/off level control and a ballast's ability to regulate lamp wattage.When rating a fixture in accordance with EPAct 1992, use this standard. For other purposes, see NEMA LE 6, a newer standard for luminaire efficacy that supersedes the LE 5 series.