Uniform Spherical Distribution (Photometric Lights)
 
 
 
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Create panel (Lights) Photometric Click Target Light or Free Light. General Parameters rollout Light Distribution (Type) group Choose Uniform Spherical from the drop-down list.

Uniform spherical distribution, as its name implies, casts light equally in all directions.

Uniform spherical light distribution

Viewport representation of a Target light with uniform spherical distribution