Mr. Ludo Haenen Profile

Ludo Haenen

Optical Designer at Philips Lighting BV

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Publications (3)

Proceedings Article | 5 March 2021 Presentation + Paper

Challenges and performance of LED-pumped polycrystalline luminescent concentrators

Christoph Hoelen, Wilco Keur, Ivo Durlinger, Dany Benoy, Dominique Bruls, Jannie Baken, Jan Jansen, Ludo Haenen, Barry Mos, Joan Yu, Eric van Grunsven

Proceedings Volume 11706, 1170616 (2021) https://doi.org/10.1117/12.2578142

KEYWORDS: Solar concentrators, Light sources, Light emitting diodes, Projection systems, Luminous efficiency, Light scattering, Light, Commercial lighting

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High luminance light modules have been developed during the past few years based on luminescent concentrators. By using wavelength conversion, the etendue limitation that prohibits brightness increase of light that has been generated is removed, which is the principle of e.g. solar luminescent concentrators and the High Lumen Density (HLD) light engines developed for projection systems. While high-power LEDs are generally limited to a brightness of ca 200 Mnit (2 x 108 lm/m2sr), LED-pumped HLD modules have demonstrated brightness values of more than 1 Gnit. With these light sources requirements can be met for high flux applications with limited source size that are out of reach of LEDs. Such cases are found in e.g. stage and entertainment lighting or in front projection. So far, the luminescent concentrator light sources were based on single-crystalline (SC) converters. In this paper we report on the development of HLD light engines based on LED-pumped polycrystalline (PC) luminescent concentrators and simplified light source architectures. We demonstrate that with LuAG:Ce and LuYAG:Ce PC luminescent concentrators, emitting in the green-yellow spectral range, identical emission spectra and module performance characteristics can be achieved as with SC luminescent concentrators. This is successfully combined with improvements that were made with respect to HLD luminance and module efficacy. Key challenges for the PC luminescent converters are found in the minimization of light scattering. We conclude that with HLD modules based on PC concentrators, over 15 klm @ <70 lm/W can be delivered with a source brightness well over 1 Gnit. By design, the preferred trade-offs can be made between efficiency, luminance, luminous flux, module size, and cost, by which flux values over 20 klm are feasible as well. Thanks to this simplified concept, further optimization for specific applications is enabled, including the application of more temperature-sensitive converter materials for e.g. longer wavelengths.

Proceedings Article | 25 February 2020 Presentation + Paper

Challenges and improvements in LED-pumped luminescent concentrators

Christoph Hoelen, Dominique Bruls, Wilco Keur, Dany Benoy, Jannie Baken, Ivo Durlinger, Jan Jansen, Ludo Haenen, Barry Mos, Joan Yu, Simon Kadijk, Eric van Grunsven

Proceedings Volume 11302, 113020A (2020) https://doi.org/10.1117/12.2543734

KEYWORDS: Light emitting diodes, Solar concentrators, Light sources, Projection systems, Interfaces, Light sources and illumination, Digital Light Processing, Blue light emitting diodes, Rods, Luminescence, LCD projection, Projection devices, Energy conversion efficiency

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Proceedings Article | 16 August 2002 Paper

New slim automotive taillight using HiPerVision lamps

Ludo Haenen, Johan Ansems, Jelle Schuurmans, Philippe de Montureux

Proceedings Volume 4775, (2002) https://doi.org/10.1117/12.479645

KEYWORDS: Lamps, Reflectors, Taillights, Neck, Temperature metrology, Electrochemical etching, Tolerancing, Legal, Fiber optic gyroscopes, Reflector design

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