Description
Parameter
Voltage required to operate the ballast. A ballast is an electrical device
that provides the starting voltage and limits the current to sustain
lamp operation. (This information is used by Revit MEP.)
Ballast Voltage
The number of leads in the circuit. Enter 1, 2, or 3. (This information
is used by Revit MEP.)
Ballast Number of Poles
Number and type of light bulbs used in the lighting fixture. (This in-
formation can be useful in schedules.)
Lamp
User-defined information about wattage requirements for the lighting
fixture.
Wattage Comments
Photometrics
: The following parameters affect rendered images. You may be able to obtain parameter values from the
manufacturer of the light source. Check the manufacturer’s web site.
The IES file that defines the light emitted from the light source. This
parameter is available when the
Light distribution
setting is Photomet-
ric Web. (See
Specifying an IES File for a Light Source
on page 1114.)
To specify a file, click in the Value column, and click
. Navigate
to the IES file, and click Open.
Photometric Web File
NOTE
Revit Architecture does not maintain a link to the IES file. If
you change or update the IES file on disk, you must also update this
parameter by navigating to the new version of the file.
The angle to tilt the light source to direct its light. (See
Angles for
Spotlights
on page 1132.) Enter a value between 0 and 160. This para-
Spot Tilt Angle
meter is available when the Light distribution setting is Spot or Photo-
metric Web. (See
Defining the Geometry of a Light Source
on page
1117.)
The angle at which the light intensity reaches 10% of the peak intens-
ity. Enter a value between 0 and 160. This parameter is available when
Spot Field Angle
the Light distribution setting is Spot. (See
Angles for Spotlights
on
page 1132.)
The angle at which the light intensity reaches 50% of the peak intens-
ity. This parameter is available when the Light distribution setting is
Spot. (See
Angles for Spotlights
on page 1132.)
Spot Beam Angle
A value used to calculate the amount of light lost (or gained) due to
environmental factors, such as dust and ambient temperature. Click
Light Loss Factor
in the Value field to display the Light Loss Factor dialog. See
Light Loss
Factor Parameters
on page 1123.
Brightness of the light before environmental factors reduce or change
the quality of the light. Click in the Value field to display the Initial
Intensity dialog. See
Initial Intensity Parameters
on page 1125.
Initial Intensity
Creating and Modifying Lighting Fixtures | 1121
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