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12 September 2006 Light recycling in filament light sources
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The laws of Planck and Kirchhoff are fundamental to a physical model yielding the radiance distribution emitted from a filament light source. The filament is made of a wire coil, or a coiled coil, or even a coiled coiled coil. Some parts of the filaments face other parts. Some light is reflected or absorbed between parts of the filament. This effect is termed light recycling. Light recycling depends on the geometry of the filament, and its material properties. Our model is based on the thermodynamics, geometry, material and electrical properties of a filament lamp. Light recycling is integrated into the model. The model calculates the one-dimensional temperature distribution in the filament by solving the time dependent heat transfer equation. The results of the model are verified with absolute radiance measurements. Parameters are identified in order to increase the accuracy of the values used for material characterization. The source model may be integrated into optical software packages.
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Ling Fu, Ralf Leutz, and Harald Ries "Light recycling in filament light sources", Proc. SPIE 6338, Nonimaging Optics and Efficient Illumination Systems III, 633802 (12 September 2006);

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