• The goniometric diagrams describing the directional distribution of the luminous intensity [Lm/sr=cd] as a function of the angles theta and phi in the photometric data file format [IESNA-LM-63-95]. The description of this file format is provided in the [paper in PDF, page31] by Ian Ashdown, for example.
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• The goniometric diagrams describing the directional distribution of the luminous intensity [Lm/sr=cd] converted to the [PBRT file format for goniometric diagram] for the PBRT rendering package. This format is essentially an environment map image in the EXR format.
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• The details of the measurements and physical dimensions of the light sources are described in Section 5.3 of the research report [PDF] with the photos, luminaire diagrams, IESNA files, etc.
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• The data in the [Zipped archive] describing the measurements of the goniometric diagrams for the six luminaires in the Microsoft Excel and PDF format.
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Model limitation 1: The offices do not contain any luminaire descriptions, however, they contain definitions of luminaire geometry. It is possible to put a luminaire below the geometry in the offices, if you need such an extension for lighting simulation. However, if viewed from the corridor, the door to the office must be opened in order to see the lighting. The luminaire 3 (File: IESradium.ies) should be used in offices to approximate the reality correctly.

Model limitation 2: As the number of luminaires is exhaustive, the luminaire maintenance factors were not measured before acqusition of the HDR photos. The luminaire maintenance factor describes the reduction of luminous flux due to the soiling of the luminaire after a certain period of time (as a ratio with respect to the initial luminous flux for a new luminaire). It is described as a function of time and it is a number smaller than 1.0. The maintenance factor can be as small as 60 percent for some types of lamp bulbs at the end of their lifetime.

Name, basic description, and luminaire photo	3D model of the luminare	Luminaire diagram (polar intensity curves) for one plane (H=0)
Luminaire 1 - Louis Poulsen 94-02511	File: IESlouis_poulsen.ies File: IESlouis_poulsen.exr	Count: 342
Luminaire 2 - Siemens 5LJ180 7-1CD2 EVG	File: IESsiemens.ies File: IESsiemens.exr	Count: 156
Luminaire 3 - Manufacturer unknown	File: IESradium.ies File: IESradium.exr	Count: 40 (offices excluded)
Luminaire 4 - RJH-TS Halogen Spot HL500	File: IESrjh_ts.ies File: IESrjh_ts.exr	Count: 22
Luminaire 5 - Philips	File: IESphilips.ies File: IESphilips.exr	Count: 54
Luminaire 6 - Osram CONCENTRA PAR 38, E27, 80W, 30 degrees (floodlight)	File: IESosram.ies File: IESosram.exr	Count: 9

The goniometric diagram was measured at the Czech Technical University , Faculty of Electrical Engineering, Department of Electrical Power Engineering using either a goniophotomer or a photometric bench (for luminaire 2 and luminaire 3 due to their size). The measurement was carried out by Jiri Drahokoupil and Dipl.-Ing. Marek Balsky. The measurements represent the far-field photometry of the light sources. The luminaires were oriented as type C luminaires (see image below).

Scheme of measurement gantry	Photo of goniophotometer	Detail of goniophotometer	Type C luminaire scheme diagram (polar intensity curves) for one plane

This page is maintained by Vlastimil Havran. The usage conditions and copyright for any content on this webpage is given at http://www.mpi-inf.mpg.de/resources/mpimodel/v1.0/index.html#Copyright It was last updated on 12th December 2009.