2011

If the LIGHTINGUNITS system variable is set to 0, the following prompt is
displayed:
Enter an option to change [Name on page 997/Intensity on page 997/Status on
page 997/
Hotspot on page 997/Falloff on page 997/shadoW on page
998/
Attenuation on page 999/Color on page 999/eXit on page 999] <eXit>:
If the LIGHTINGUNITS system variable is set to 1 or 2, the following prompt
is displayed:
Enter an option to change [
Name on page 997/Intensity factor on page
997/
Photometry on page 997/Status on page 997/Hotspot on page 997/Falloff on
page 997/
shadoW on page 998/Attenuation on page 999/filterColor on page
999/
eXit on page 999] <eXit>:
NOTE When the LIGHTINGUNITS system variable is set to 1 or 2, the Attenuation
option has no affect on the creation of the light. It is only maintained for scripting
compatibility.
Name
Specifies the name of the light. You can use uppercase and lowercase letters,
numbers, spaces, hyphens (-), and underscores (_) in the name.
Intensity/Intensity Factor
Sets the intensity or brightness of the light. The range is 0.00 to the maximum
value that is supported by your system.
Hotspot
Specifies the angle that defines the brightest cone of light, which is known to
lighting designers as the beam angle. This value can range from 0 to 160
degrees or the equivalent values based on AUNITS.
Falloff
Specifies the angle that defines the full cone of light, which is also known as
the field angle. This value can range from 0 to 160 degrees. The default is 50
degrees or the equivalent values based on AUNITS. The falloff angle must be
greater than or equal to the hotspot angle.
Status
Turns the light on and off.
Photometry
Photometry is the measurement of the luminous intensities of visible light
sources. Photometry is available when the LIGHTINGUNITS system variable
is set to 1 or 2.
In photometry, luminous intensity is a measure of the perceived power emitted
by a light source in a particular direction. Luminous flux is the perceived
SPOTLIGHT | 997