IES TM-21-11

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SKU: TM-21-11 Category:


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.

Softcover or Secure PDF: 25 pages
Publisher: Illuminating Engineering Society (2011)
SKU: IES TM-21-11
ISBN-13: 978-0-87995-259-4
Dimensions: 8½” x 11″

Additional information

Weight 1 lbs
Dimensions 11 × 8.5 × 0.25 in

Digital, Softcover