IES TM-21-19 PDF Download

The IES TM-21-19 standard is a set of recommendations for determining the long-term maintenance of flux in LED light sources. These recommendations are based on data obtained through testing LED light sources following the ANSI/IES LM-80-15 standard, which is the approved method for measuring luminous flux and color maintenance of LED packages, arrays, and modules.

It is important to note that the TM-21-19 standard should not be used to project lumen, photon, or radiant flux maintenance levels below 70%. This indicates that the recommendations provided in this standard are focused on predicting and projecting the maintenance of these flux characteristics for LED light sources above the 70% threshold. The TM-21-19 standard serves as a useful guide for assessing the long-term performance and durability of LED light sources, ensuring adequate illumination over extended periods of time.