The National Electrical Manufacturers Association (NEMA) has released the Procedure for Determining Luminaire Efficacy Ratings for Commercial, Non-Residential Downlight Luminaires, LE 5A-1999. The standard was developed to assist federal and state government, electric utilities, and lighting manufacturers in performing a standardized test method for determining the luminaire efficacy rating (LER) of incandescent, compact fluorescent, and low-wattage HID downlights. It allows manufacturers ...

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