2009

eliminate edges that can appear on a surface under certain circumstances.
Default=50.
NOTE Soften Diffuse Edge reduces the amount of light, slightly. You can counter
this, to some extent, by increasing the Multiplier value.
Diffuse When on, the light affects the diffuse properties of an object's surface.
When off, the light has no effect on the diffuse surface. Default=on.
Specular When on, the light affects the specular properties of an object's
surface. When off, the light has no effect on the specular properties.
Default=on.
For example, by using the Diffuse and Specular check boxes you can have one
light color the specular highlights of an object, while not coloring its diffuse
area, and then have a second light color the diffuse portion of the surface
while not creating specular highlights.
Ambient Only When on, the light affects only the ambient component of
the illumination. This gives you more detailed control over the ambient
illumination in your scene. When Ambient Only is on, Contrast, Soften Diffuse
Edge, Diffuse, and Specular are unavailable. Default=off.
The effect of Ambient Only isn't visible in viewports. It appears only when
you render the scene.
A: Affect specular only
B: Affect diffuse only
C: Affect ambient only
Common Lighting Rollouts and Dialogs | 5111