Title: A new integrating sphere design for spectral radiant flux determination of light-emitting diodes (LEDs)
Authors: Hanselaer, Peter *
Keppens, Arno * ×
Forment, Stefaan
Ryckaert, Wouter
Deconinck, Geert #
Issue Date: 21-Aug-2009
Publisher: IOP Pub.
Series Title: Measurement science & technology vol:20 issue:9
Article number: 095111
Abstract: Light-emitting diode (LED) technology is developing very quickly and may be considered an
alternative for traditional light sources. However, at this moment, manufacturers and end users
of LEDs are facing a rather basic but major problem. The lack of standardization regarding
optical and electrical characterization of LEDs appears to compromise a successful
implementation. In particular, numbers quoted for the luminous flux, and consequently for the
efficacy of LEDs, are very sensitive data because they are used to impress and push the LED
market. In this paper, the most was made of the typical hemispherical radiation of high-power
LEDs to increase the accuracy of the flux determination using a custom-made integrating
sphere. Recently developed measurement techniques such as the use of an external spectral
irradiance standard and an optimized spectral irradiance detection head are combined with a
very particular port geometry and a minimized baffle area. This results in a uniform spatial
response distribution function (SRDF), which guarantees an accurate radiant and luminous
flux determination, irrespective of the spatial intensity distribution of the LED package or
luminaire. The effect of the directional response of the detector head on the SRDF has been
explored. Measurements on LED devices with and without external optics are presented,
illustrating the possibilities of the measurement setup.
ISSN: 0957-0233
Publication status: published
KU Leuven publication type: IT
Appears in Collections:ESAT - ELECTA, Electrical Energy Computer Architectures
Technologiecluster ESAT Elektrotechnische Engineering
Electrical Engineering (ESAT) TC, Technology Campuses Ghent and Aalst
* (joint) first author
× corresponding author
# (joint) last author

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