Autodesk LIGHTSCAPE, Manual

Page: 318 / 362

IES Standard File Format E
310
Lightscape
8.
The number of vertical angles in the photometric
web.
9.
The number of horizontal angles in the photo-
metric web.
10. 1
11.
The type of unit used to measure the 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 dimen-
sions because you can associate a given luminous in-
tensity distribution with any of the luminaire
geometric entities supported by Lightscape. It is nor-
mally given as 0 0 0.
13.
1.0 1.0 0.0
14.
The set of vertical angles, listed in increasing or-
der. If the distribution lies completely in the bottom
hemisphere, the 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 deter-
mines the degree of lateral symmetry displayed by the
intensity distribution. If it is 0°, the distribution is ax-
ially symmetric. If it is 90°, the distribution is sym-
metric in each quadrant. If it is 180°, the distribution
is symmetric 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 in-
valid.
16. The set of candela values. First all the candela val-
ues corresponding to the first horizontal angle are
listed, starting with the value corresponding to the
smallest 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 horizontal an-
gle. Each vertical slice of values must start on a new
line. Long lines may be broken between values as
needed by following the instructions given earlier.
The following is an example of a photometric data file
accepted by Lightscape:
IESNA91
[TEST] Simple demo intensity
distribution
[MANUFAC] Lightscape Technologies,
Inc.
TILT=NONE
1
-1
1
8
1
1
2
0.0 0.0 0.0
1.0 1.0 0.0
0.0 5.0 10.0 20.0 30.0 45.0 65.0
90.0
0.0
1000.0 1100.0 1300.0 1150.0 930.0
650.0 350.0 0.0