scope:

The purpose of this Standard is to describe a method to establish reasonable claims of initial light output equivalency for single-ended omnidirectional LED replacement lamps that are intended to replace HID lamps.

The method accounts for two factors that influence the equivalency claims:

a. Improved lumen maintenance vs. HID. Because LED lamps have a longer useful life and their light output degrades more slowly than most HID lamps, this factor results in initial luminous flux for an LED replacement lamp that is lower than the equivalent HID lamp. This factor is independent of the luminaire.

b. The spectrum of the light, in the case of outdoor (or other low-light-level) applications. In darker environments, reaction time is faster, recognition of objects and people is more accurate, and the perception of brightness is higher if the light source has high color rendering. This factor depends on the spectrum of the light and is independent of the luminaire.

The Standard does not address other lamp characteristics, such as safety, physical dimensions, other light quality parameters, or reporting requirements. Because of the strong dependence on applications, it also does not provide corrections for the directionality of a light source, though an informative appendix addressing directionality is included.