2011

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. The maximum
length is 256 characters.
Enter light 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.
Enter intensity (0.00-max float) <1.0000>:
Status
Turns the light on and off. If lighting is not enabled in the drawing, this setting
has no effect
Enter status [oN/oFf] <On>:
Photometry
Photometry is available when the LIGHTINGUNITS system variable is set to
1 or 2. Photometry is the measurement of the luminous intensities of visible
light sources.
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
power per unit of solid angle. The total luminous flux for a is the perceived
power emitted in all directions. Luminance is the total luminous flux incident
on a surface, per unit area.
Enter a photometric option to change [Intensity/Color/eXit] <I>:
Intensity Enter intensity (Cd) or enter an option [Flux/Illuminance]
<1500.0000>:
Enter an intensity value in candelas, the perceived power in a luminous flux
value, or illuminance value for the total luminous flux incident on a surface.
■ Candela (symbol: cd) is the SI unit of luminous intensity (perceived power
emitted by a light source in a particular direction). Cd/Sr
■ Lux (symbol: lx) is the SI unit of illuminance. Lm/m^2
■ Foot-candle (symbol: fc) is the American unit of illuminance. Lm/ft^2
816 | Chapter 16 P Commands