The Illuminating Engineering Society of North America (IESNA), in conjunction with organizations like ANSI and ASHRAE, publishes guidelines, standards, and handbooks that allow categorization of the illumination needs of different built environments. Manufacturers of lighting equipment publish photometric data for their products, which defines the distribution of light released by a specific luminaire. This data is typically expressed in standardized form defined by the IESNA. COUNT 3
QSN1 What does the IESNA stand for?  ANS1 The Illuminating Engineering Society of North America QSN2 Who else publishes along with IESNA?  ANS2 ANSI and ASHRAE QSN3 What defines photo metric data? ANS3 distribution of light released