IES LM-66-00

IESNA Approved Method for the Electrical and Photometric Measurements of Single-Ended Compact Fluorescent Lamps This Lighting Measurements Guide describes an approved method to obtain uniform and reproducible measurements of the electrical and photometric characteristics of single-ended compact fluorescent lamps (CFLs) under standard conditions in 60-Hz alternating current circuits. Excluded are Circline and U-bend lamps, which are covered in LM-9-99. This Guide revises and replaces the previous edition last published in 1991. The single-ended CFL is a low pressure mercury discharge light source with compact geometry obtained from two (or more) arc tubes either folded or connected by a bridge. The designs generally include a “cold chamber” which provides control of the mercury vapor pressure. These lamps may be mounted in one single lamp base which plugs into one lamp holder, or integrated with a ballast circuit which is built as part of the lamp system. The photometric information usually required is total luminous flux (lumens), luminous intensity (candelas) in one or more directions, and color. The electrical characteristics usually measured are line voltage, lamp current, lamp voltage, and lamp power. In the case of rapid start CFLs, the power measurements may include both the “arc watts” and the cathode power. Following a brief introduction, which includes a discussion of nomenclature, the main sections of this Guide are: ambient conditions specifying certain restrictions on temperature and air movement needed to obtain repeatable measurements; power source characteristics defining wave shape and voltage regulation requirements; ballasts citing the reference ballast needed per specific ANSI documents; circuits detailing specific instrumentation hookups for testing non-integrated and integrated CFLs; lamp connections wiring preheat start (non-integrated) or rapid start (non integrated) to the test circuit; lamp stabilization seasoning and preburning CFLs, then transferring them to a test position; electrical instrumentation obtaining desired measurement accuracy; photometer defining the relative spectral responsivity required; photometric test procedures covering normal intensity, intensity distribution, and integrating sphere measurements; color measurements supplying specific CIE and CRI references; and test report identifying all significant data to be recorded for each lamp tested. This Guide also contains four Annexes covering (1) elevated test temperatures, (2) accelerated preburning, (3) non base up lamp tests, and (4) detector spectral mismatch errors, plus a Glossary.