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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. |
