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