IES LM-49-20 PDF Download

The IES LM-49-20 standard provides guidelines for conducting consistent and reliable measurements during the life testing of various types of incandescent lamps. The standard specifically focuses on general service incandescent lamps, tungsten-halogen lamps, series airport markers, and street lighting lamps. It does not cover automotive, miniature and sub-miniature, photo-optic, and other specialized lamp types.

The standard outlines the procedures to be followed and the precautions to be taken to ensure uniform testing conditions. The life testing is performed under either the rated voltage or the rated current of the lamps. It aims to provide a method for evaluating the longevity and performance of these incandescent lamps under standard testing conditions.