scope:

This international standard is applicable to LED package for general lighting service. For 34 clarification: this method is applicable to both luminous flux and radiant flux measurement 35 data. 36 It specifies procedures and conditions (criteria) for measuring and projecting the long-term 37 luminous flux maintenance behaviour of LED packages based on limited luminous flux 38 maintenance test data. 39 The test method is based on the procedure of ANSI/IES LM-80-15 (LM-80). 40 The long-term projection is based on the exponential-fit-function procedure of IES TM-21-11 41 (TM-21), and gives an alternative Border Function procedure in the case that the exponential42 fit-function of TM-21 is not applicable.