Dr. Peter Deurenberg Profile

Dr. Peter Deurenberg

at Philips Lighting BV

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Author

Publications (4)

Proceedings Article | 12 September 2006 Paper

Color tunable LED spot lighting

C. Hoelen, J. Ansems, P. Deurenberg, W. van Duijneveldt, M. Peeters, G. Steenbruggen, T. Treurniet, A. Valster, J. W. ter Weeme

Proceedings Volume 6337, 63370Q (2006) https://doi.org/10.1117/12.694799

KEYWORDS: Light emitting diodes, Sensors, Temperature metrology, RGB color model, Lamps, Control systems, Light sources and illumination, Light sources, Collimators, LED lighting

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A new trend in illumination is to use dynamic light to set or dynamically vary the ambience of a room or office. For this we need color tunable spots that can reliably vary over at least a wide range of color temperatures, and preferably also more saturated colors. LEDs are in principle ideally suited for this application thanks to their nature of emitting light in a relatively narrow band. For color tunable spot lighting based on the concept of mixing RGB LED colors, the key results have been presented before. Limitations of these 3-intrinsic-color mixing systems with high color rendering properties are found in a limited operating temperature range due to wavelength shifts, a limited color temperature range, and a low maximum operating temperature due to a strong flux decrease with increasing temperature. To overcome these limitations, a 3-color R_pcGB system with phosphor-converted red (R_pc) and a 4-color RAGB system have been investigated. With both systems, a CRI of at least 80 can be maintained over the relevant color temperature range of approximately 2700 K to 6500 K. In this paper we compare these concepts on overall system aspects and report on the performance of prototype spot lamps. The main features of the RAGB and R_pcGB spot lamp concepts can be summarized as: 1) The RAGB spot overcomes CRI and gamut shortcomings of RGB light sources and gives much freedom in wavelength selection, but suffers from temperature sensitivity and complex controls; 2) The R_pcGB spot overcomes shortcomings concerning CRI and thermal dependence of RGB sources and enables relatively simple controls, but needs an improved overall red efficacy. With both color concepts, prototype spot lamps have been built. The amber to red emitting nitridosilicate-based phosphors can be wavelength-tuned for optimal performance, which is found at a peak emission around 610 nm for high color quality systems. This results in a simple and very robust system with good color consistency. For the RAGB system, a spot lamp has been developed, consisting of a 4-chip light source, an optical system with mixing rod that provides color homogenization and beam shaping, and an electronic drive and control unit based on temperature feed forward. Flux- and color-rendering performance can be tuned according to the application requirements.

Proceedings Article | 20 April 2006 Paper

Multichip colour variable LED linear modules

Lingli Wang, Martijn Riemeijer, Georges Calon, Peter Deurenberg, Theo Treurniet, Edwin van Lier, Johan Ansems, Oscar Chao, Virginie Mercier, Koen van Os, Gerard Lijten

Proceedings Volume 6183, 618322 (2006) https://doi.org/10.1117/12.662666

KEYWORDS: Light emitting diodes, Temperature metrology, Free space optics, Reflectors, Sensors, Calibration, Optical design, Collimators, Dielectrics, Free space

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Proceedings Article | 2 September 2005 Paper

Multi-chip color variable LED spot modules

C. Hoelen, J. Ansems, P. Deurenberg, T. Treurniet, E. van Lier, O. Chao, V. Mercier, G. Calon, K. van Os, G. Lijten, J. Sondag-Huethorst

Proceedings Volume 5941, 59410A (2005) https://doi.org/10.1117/12.623010

KEYWORDS: Light emitting diodes, Light sources and illumination, RGB color model, Temperature metrology, Collimators, Scattering, LED lighting, Reflectors, Diffusers, Silicon

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The unique features of light emitting diodes (LEDs) such as intrinsic color generation and relative low temperature operation enable completely new lighting concepts. The ongoing increase in performance of LEDs reaching efficacy levels of more than 30 lm/W for illumination grade white light with the promise of reaching over 75 lm/W makes them also applicable for higher luminous applications such as spot and flood lighting, accent lighting and architectural lighting. For the new lighting feature of ambiance creation, which requires at least variation of the color temperature of the light and preferably also selection of more saturated colors, LEDs are ideally suited. In this paper we report on the overall system aspects to color variable LED spot lighting and on the performance of prototype spot modules. Mixing of the light is performed within the lighting module by a combination of dense packing of red/amber, green and blue emitting dice, and light collimation with facetted optics and small angle diffusion, resulting in a homogeneous appearance of the light source and a color point inhomogeneity Δu'v' in the beam (>90% of total flux) of less than 0.01. A color rendering index (R_a8) of over 80 can be obtained over a large temperature and color temperature range with the 3-color system for a specific combination of 5 nm wide wavelength bins. In the prototype spot modules, between 9 and 14 dice are mounted on a common substrate and integrated with the primary collimating optics that is based on total internal reflection. Nominal power of the spot module is 10W. The average thermal resistance between the die junctions and the housing is 2 K/W. The optical efficiency of the module is 70%. The maximum luminous flux in the beam, which has a full width at half maximum (FWHM) of 20-25°, is about 200 lm. The system has thermal and optical sensors that provide the signals for a closed control loop to compensate for run-up and differential ageing effects. The resulting color point accuracy in the u'v' color space is better than 0.01. This shows the feasibility of easy-to-use lighting modules that offer advanced lighting options with adjustable, reliable and accurate output.

Proceedings Article | 2 September 2005 Paper

Achieving color point stability in RGB multi-chip LED modules using various color control loops

P. Deurenberg, C. Hoelen, J. van Meurs, J. Ansems

Proceedings Volume 5941, 59410C (2005) https://doi.org/10.1117/12.623020

KEYWORDS: Light emitting diodes, Sensors, Temperature metrology, Calibration, Light sources and illumination, Photodiodes, LED lighting, RGB color model, Control systems, Actuators

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