Nov 28, · What TM is and is not! First, TM does not determine a traditional life or time-to-failure like we are used to for other lighting sources. FIG. 3. What TM does provide is a projection of the lumen maintenance of an LED source (package/array/module) based on data collected according to LM This projection information can then be used. Feb 07, · The US Environmental Protection Agency (EPA) has made available the Energy Star TM calculator, which is based on the IES’s (Illuminating Engineering Society’s) Technical Memorandum. TM What it is, and why it is important •IESNA TM (Technical Memorandum) specifies how to extrapolate the LM lumen maintenance data to times beyond the LM test time. For example: EPA ENERGY STAR ® Luminaire Guide requires L70 of 25, or 35, hours. •TM is important because it is referenced in the EPA ENERGY STAR.
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