Abstract
Even though energy-efficient and sustainable solutions,
such as light emitting diodes (LEDs), have become popular
in general lighting, mainly incandescent lamps are used
as measurement standards in photometry. Optical
properties of the LED lamps together with the often
unstable built-in power converters bring challenges to
NMIs and testing laboratories. Due to the narrow and
complicated spectra of the LED lamps, the uncertainties
of traditional photometers calibrated by incandescent
lamps tend to increase when LED lamps are measured.
Switching from an incandescent lamp to an LED-based
calibration source would decrease the uncertainty related
to the spectral mismatch correction. LED-based
photometric standard lamps would also have other
benefits, such as long lifetime and good temporal
stability. Moreover, as spectra of white LED lamps are
limited to the visible wavelength range, a novel method
for illuminance measurements based on the Predictable
Quantum Efficient Detector (PQED) can be used to
characterize these standard lamps with luminous flux
uncertainties significantly below 1 % (k = 2) at NMIs.
The method eliminates the need of photometric filters in
realization of the illuminance unit. Instead, the
photometric weighting is carried out numerically using a
separately measured relative spectrum of the source. Well
characterized LED-based calibration lamps, together with
improved electrical power measurement, would reduce
measurement uncertainties of illuminance, luminous
intensity, luminous flux and luminous efficacy
measurements of LED lamps at NMIs and testing
laboratories. This would have a high impact on the
development of energy-efficient LED lamps and on the
assessment of the energy saving potential of solid state
lighting. It is also shown, that recent advances in
illuminance and electrical power measurement will enable
luminous efficacy measurements of LED lamps with
uncertainty well below the present state-of-the-art level
of about 1 % (k = 2).
Original language | English |
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Title of host publication | CIM2015 |
Subtitle of host publication | 17th International Congress of Metrology |
Editors | Bernard Larquier |
Publisher | EDP Sciences |
Number of pages | 6 |
DOIs | |
Publication status | Published - 2015 |
MoE publication type | Not Eligible |
Event | 17th International Congress of Metrology, CIM 2015 - Paris, France Duration: 21 Sept 2015 → 24 Sept 2015 |
Conference
Conference | 17th International Congress of Metrology, CIM 2015 |
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Abbreviated title | CIM 2015 |
Country/Territory | France |
City | Paris |
Period | 21/09/15 → 24/09/15 |
Keywords
- LED
- LED photometry