Luminous Intensity Comparison Based on New Standard Lamps With Led Reference Spectrum

Abstract

Photometric calibrations are mainly based on the use of scientific grade incandescent standard lamps [CIE 2002]. Most of the measurement methods and reference spectra used in photometry were developed long before modern solid-state lighting (SSL) products were invented and introduced into the lighting market. In addition, phasing-out of incandescent lamps for lighting applications poses a metrological problem: all lamps and luminaires measured in practice differ completely in their behaviour with respect to spectral distribu tion, flicker and aging, as compared to incandescent lamps used in photometer calibrations .

Recent advances and perspectives in photometry in the era of LED lighting

“…Practical LED light sources [18][19][20], with spectral irradiance resembling the L41 spectrum, have been developed. Even if their spectra would somewhat deviate from the reference spectrum L41, they would reduce the spectral mismatch error in photometer calibration relative to calibrations using incandescent lamps.…”

“…Even if their spectra would somewhat deviate from the reference spectrum L41, they would reduce the spectral mismatch error in photometer calibration relative to calibrations using incandescent lamps. The LED light sources [18][19][20] have also other promising features, such as robustness and stability, which make them attractive as complementary standard lamps, working standards, and comparison artefacts. Their performance will be tested in a forthcoming international comparison measurement with global coverage of participants.…”

Characterization of the LED filament lamp for luminous intensity calibration

“…The European research project 'Future photometry based on solid-state lighting products' works on the fundamental photometry requirements with white LED sources. A luminous intensity comparison is conducted based on a reference luminous intensity source type A (LIS-A) and LIS-A is the LED lamp type name defined in the European project [9]. The LIS-A has a similar spectrum to the reference white LED spectrum considered in CIE TC2-90, and an active temperature-controlled heat-sink at the rear side.…”