|Chromaticity diagram for ANSI C78.377|
Importance of standards
Standards are very important for several reasons. Without standards, comparison is difficult or impossible. In many cases product specifications are not traceable to an authoritative reference, making all such data suspect at best, and disingenuous at worst. Furthermore, some manufacturers play specification games; this is unacceptable. Without standards, customers and specifiers are uneasy about specifying and purchasing LED-based products. Emplacing standards lessens this issue and, as this community grows comfortable with the standards-based approach, they will specify more, not less. The market grows; adoption increases and the results benefit both users and manufacturers. Subsequently, LEDs can also provide societal benefits in terms of energy saved and carbon footprints reduced. This chain of reasoning is not to be taken lightly. Without standards, LED lighting will become a “Wild West” of disorder and confusion.
Standards finalized in 2008
Chromaticity: ANSI C78.377-2008
“Specifications for the Chromaticity of Solid State Lighting Products” (see figure 1).
Luminous Flux: IESNA LM-79
“Electrical and Photometric Measurements of Solid-State Lighting Products”
Lumen Maintenance: IESNA LM-80
“Measuring Lumen Maintenance of LED Light Sources”
Definitions: IESNA RP-16 Addendum A
“Nomenclature and Definitions for Illuminating Engineering”
This article was published in the April 2009 issue of LEDs Magazine.
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