Organization: The Illuminating Engineering Society of North America (IESNA) Edition Date: 25/07/2011 This document recommends a method for projecting the lumen maintenance of LED light sources from the data obtained by the procedures found in IES document LM-80-08 Approved Method for Measuring Lumen Maintenance of LED Light Sources. LED light sources provide a very long usable life but light output gradually depreciates over time. TM-21-11 provides the method for determining when the “useful lifetime” of an LED is reached, a point when the light emitted from an LED depreciates to a level where it is no longer considered adequate for a specific application. Lumen maintenance of LEDs can vary from manufacturer to manufacturer and between different LED package types produced by a single manufacturer.
Organization: The National Electrical Manufacturers Association (NEMA). Edition Date: 28/02/2011 This standard provides specifications for and operating characteristics of non-integral electronic drivers (power supplies) for LED devices, arrays, or systems intended for general lighting applications. Electronic drivers are devices that use semiconductors to control and supply dc power for LED starting and operation. The drivers operate from multiple supply sources of 600 V maximum at a frequency of 50 or 60 hertz.
Organization: The National Electrical Manufacturers Association (NEMA) Edition Date: 03/09/2009 This document provides guidelines on solid state lighting sub assembly interface for luminaires – guidelines does not apply to LED retrofit lamps. This new white paper, prepared by the NEMA Solid State Lighting Section, covers the design and construction of interconnects for solid-state lighting applications. It compiles the latest industry information regarding mechanical, electrical, and thermal connections and documents existing industry best practices
Organization: The Illuminating Engineering Society of North America (IESNA) Edition Date: 31/12/2007 This approved method describes the procedures and precautions for performing reproducible measurements of total luminous flux, electrical power, luminous intensity distribution and chromaticity of solid-state lighting (SSL) products for illumination purposes under standard conditions. Covers LED-based SSL products with control electronics and heat sinks incorporated. It does not cover external operating circuits or external heat sinks (e.g., LED chips, LED packages, and LED modules). Uses absolute photometry rather than relative photometry (historically the lighting industry standard) for the measurement of SSL.
Organization: The Illuminating Engineering Society of North America (IESNA) Edition Date: 2013 TM-25-13 provides recommendations for a standard ray file format to describe the emission properties of light sources. The ray file format contains information necessary to interface between ray tracing or other optical design, simulation, analysis and metrology software used in lighting applications.