8

Example of Photometric Data File 1173
1. IESNA91
2. [TEST] the test report number of your data
3. [MANUFAC] the manufac turer of the
luminaire
4. TILT=NONE
5. 1
6. The initial r ated lumens for the lamp used in
thetestor-1ifabsolutephotometryisusedand
the intensity values do not depend on differe nt
lamp ratings.
7. A multiplying factor for a ll the candela values
in the file. This makes it possible to easily
scaleallthecandelavaluesinthefilewhen
the measuring device operates in unusual
units—for example, when you obtain the
photometricvaluesfromacatalogusinga
ruler on a goniometric diagram. Normally the
multiplying factor is 1.
8. The number of vertical angles in the
photometric web.
9. The number of horizontal angles in the
photometric web.
10.1
11.Thetypeofunitusedtomeasurethe
dimensions of the luminous opening. Use 1 for
feet or 2 for meters.
12.The width, length, and height of the luminous
opening. Currently, Lightscape ignores these
dimensions because you can associate a given
luminous intensity distribution with any of
the luminaire geomet ric entities suppor ted by
Lightscape. It is normally given as 0 0 0.
13.1.0 1.0 0.0
14.The set of vert ical angles, listed in increasing
order. If the distribution lies completely in
the bottom hemisphere, t he first and last
angles must be 0° and 90°, respectively. If
the distribution lies completely in the top
hemisphere , the first and last angles must be 90°
and 180°, respectively. Otherwise, they must be
0° and 180°, respectively.
15.The set of horizontal angles, listed in increasing
order. The first angle must be 0°. The last angle
determines the degree of lateral sym metry
displayed by the intensity distribution. If it
is 0°, the distribution is axially symmetric.
If it is 90°, the distribution is symmetric in
each quadrant. If it is 180°, the distribution is
symmetr ic about a vertical plane. If it is greater
than 180° and less than or equal to 360°, the
distribution exhibits no lateral symmetries. All
other values are invalid.
16.T he set of candela values. First all the candela
values corresponding to the first horizontal
angle are listed, starting with the value
corresponding to the sma l lest vertical angle and
moving up the associated vertical plane. Then
the candela values corresponding to the vertical
plane through the second horizontal angle are
listed, and so on until the last horizont al angle.
Each vertical slice of values must start on a new
line. Long lines may be broken between values
as needed by following the instruc tions given
earlier.
Here is an
example of a photometric data file (page
2–1173)
.
Ex ample of P hotometr ic Da ta File
The follow ing is an example of a photometric data
file: