IES TM-21-11 PDF Download

The IES TM-21-11 standard is a document that provides guidelines and recommendations for estimating the long-term lumen maintenance of LED light sources. It is based on data obtained from testing LED light sources using the IES LM-80-08 standard, which is the approved method for measuring lumen maintenance of LEDs.

The purpose of the IES TM-21-11 standard is to provide manufacturers, designers, and users of LED lighting with a methodology for predicting how the light output of LEDs will change over time. This is important because the light output of LEDs can deteriorate over time, and it is crucial to have accurate projections of how much light will be maintained over the product's lifetime.

The IES TM-21-11 standard takes into account various factors that can influence the lumen maintenance of LEDs, such as temperature, current, and aging effects. It provides formulas and procedures for extrapolating lumen maintenance data obtained from testing over a relatively short period to estimate the performance over a longer duration.

By using the guidelines provided by the IES TM-21-11 standard, manufacturers and designers can make informed decisions about the expected lifespan and performance of LED light sources, enabling them to select suitable products for different lighting applications. Additionally, it helps users maintain appropriate lighting levels and plan for relamping or retrofitting projects.