2012

create a point light by entering the POINTLIGHT command or by selecting a
point light from the Lights panel on the ribbon.
You create a target point light with the TARGETPOINT command. The
difference between the target point light and a point light is the additional
target properties that are available. A target light can be pointed to an object.
A target point light can also be created from a point light by changing the
target property of the point light from No to Yes.
In the standard lighting workflow, you can set a point light manually so its
intensity diminishes with respect to distance either linearly, according to the
inverse square of the distance, or not at all. By default, the attenuation is set
to None.
Point Lights in Photometric Workflow
A free point light can have photometric distribution properties. The attenuation
for a photometric point light is always set to inverse square.
When the LIGHTINGUNITS system variable is set to 1 (American units) or 2
(International SI units) for photometric lighting, additional properties are
available for a point light. On the Properties palette, photometric properties
are
■ Lamp Intensity. Specifies the inherent brightness of the light. Specifies the
intensity, flux or illuminance of the lamp.
■ Resulting Intensity. Gives the final brightness of the light. (Product of lamp
intensity and intensity factor. Read-only.)
Use Point Lights | 2153