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.\" RCSid $Id$
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.TH LAMP.TAB 5 2021-08-18 RADIANCE
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.SH NAME
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lamp.tab \- table of lamp colors and lumen depreciation factors
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.SH DESCRIPTION
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Lamp.tab contains a table of lamp data. The lines are formatted thus:
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.IP
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.RI / "light source name re" /
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.I x y m
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.PP
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or
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.IP
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.RI / "light source alias re" /
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.RI ( "light source name" )
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.PP
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The first form gives the color and depreciation of a lamp whose name
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matches the light source name regular expression. The second gives
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an alternate name for a light source. Comments beginning with '#'
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are supported.
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.SS Notes
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.IP \(bu
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Basic regular expressions (original grep) are used.
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.IP \(bu
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.I x
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and
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.I y
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are CIE x and y coordinates. These give the color of the light. See
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.UR https://www.iso.org/standard/74165.html
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ISO/CIE 11664-3:2019
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.UE
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\*(lqColorimetry \(em Part 3: Cie Tristimulus Values\*(rq for
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definitions.
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.IP \(bu
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.I m
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is a "coefficient of depreciation." This is a multiplier used to
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reduce the output of a lamp to the value it would have after it has
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been in operation for its expected life. It is used to predict the
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output of a lighting system comprised of many lamps. See the
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.I IES Lighting Handbook
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for more information.
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.IP \(bu
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Any character except '#' may be used to delimit the light source name
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regular expression; '/' is conventional, but not required.
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.IP \(bu
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Comments begin with '#' and may occur at the end of any line.
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.IP \(bu
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Blank lines are ignored.
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.SH AUTHOR
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Greg Ward
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.SH SEE ALSO
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.BR ies2rad (1),
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.BR pfilt (1)
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