NEMA LE 5-2001根据每瓦特的额定流明确定灯具效能等级，并将灯具分为合理代表大容量灯具特性的类别。作为广泛使用灯具的国家自愿信息和评级计划的基础。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 5-2001 establishes a luminaire efficacy rating based on rated lumens per watt and organizes luminaires into categories that will reasonably represent the characteristics of high-volume luminaires. Serves as the basis for the National Voluntary Information and Rating Program for widely-used luminaires.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.