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Enclosing IES File Notes
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RCSid "$Id$"
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The following notes describe how MGF data is to be referred to by
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an enclosing IES luminaire file, and these notes are in a state of flux.
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The basic method for specifying an MGF geometry file within an IES
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file is a single line immediately preceeding the TILT= line, which reads:
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GEOM=file.mgf
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where "file.mgf" is replaced by the name of the relevant MGF file.
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IES data file contains simplified geometry, which must completely
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enclose the detailed geometry specified by the "GEOM=file.mgf" line.
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This detailed geometry file is always in meters, whatever the units of
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the enclosing IES file, and must have its origin at the center of the
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simplified geometry. The X-axis corresponds to the 0-180 degree plane,
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the Y-axis corresponds to the 90-270 degree plane, and the Z-axis
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corresponds to the up direction. (This is a right-handed coordinate
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system.)
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The emission values in the MGF file will be multiplied by the usual
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IES luminaire factors, i.e. the tilt factors (if any), the candela
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multiplier, the ballast factor and the ballast lamp factor. Thus,
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the MGF file emissions should correspond to those of the as-tested
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luminaire configuration.
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