ANSI (American National Standard Institute) - Establishes definitions of solid state lighting devices and components. It also provides a common terminology. IESNA (Illuminating Engineering Society of North America) - Provides procedures for reproducible measurements of photometry, color and electrical characteristics of solid state lighting products. UL (UnderwritersLaboratories) - Writes safety standards for LED products including drivers, controllers, arrays, packages and modules. NEMA (National Electrical Manufacturers Association) - makes recommendations for mechanical, thermal and electrical interfaces between luminaires.