Light Sources; Photometrics And Ies Files - Autodesk 256B1-05A761-1301 - AutoCAD Revit Structure Suite 2010 User Manual

Light Sources

A light source is the part of a lighting fixture that emits light (such as a light bulb). In general, each lighting
fixture family has one light source. To create a lighting fixture that uses multiple light sources (such as a
chandelier or a set of track lights), create a nested family.
For each light source, you can specify the shape of the light element (point, line, rectangle, or circle), and
the light distribution (spherical, hemispherical, spot, or
characteristics, such as Light Loss Factor, Initial Intensity, and Initial Color Control. In a project, you can
adjust the position and brightness of each light source to achieve the desired lighting effects.
A table lamp and its light source
Related topics
Creating Lighting Fixtures with Multiple Light Sources
Defining a Light Source
Controlling the Brightness of a Light Source
Adjust Light Sources Before Rendering
Displaying Light Sources in a View

Photometrics and IES Files

In Revit Architecture, photometrics are parameters for creating realistic lighting fixture families. Photometrics
help to define the visible light that displays in a rendered image of a building model.
The photometrics that are available for a particular lighting fixture depend on its light source definition.
They include parameters such as Light Loss Factor, Initial Intensity, and Initial Color Control.
When you specify that the light distribution of a light source is
file. An IES file is a text file provided by a lighting manufacturer. It describes the intensity of a light source
at points on a spherical grid. It also describes the geometry of how the light comes out of the lighting fixture
(the photometric web).
1166 | Chapter 19 Rendering
on page 1180
on page 1196
on page 1168
on page 1192
photometric web). You can also define photometric
on page 1170
Photometric Web, you can specify an IES