Intensity – The total energy that the light emits.
Light Color – The color that the light emits.
Intensity Units – Determines how the light's Intensity setting should be interpreted.
Source Radius – Radius of light source shape. Value of 0 will treat the light as Omni Light. Values greater than 0 will treat it as a Sphere Light.
Affects World – When enabled (the default), the light contributes to the lighting in the level. Disabling it will stop the contribution of the light in the environment.
Cast Shadows – When enabled (the default), the light casts shadows. Turn this option off to disable shadow casting for the light.
Use Inverse Squared Falloff – Specifies whether to use the physically based inverse squared distance falloff.
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tip
Lights in Unreal Engine 4.19 and 4.20 have the Intensity Units option. Make sure to change this to Unitless when creating an Unreal light.
