uint32 bUseInverseSquaredFalloff: 1
Whether to use physically based inverse squared distance falloff, where AttenuationRadius is only clamping the light's contribution. Disabling inverse squared falloff can be useful when placing fill lights (don't want a super bright spot near the light). When enabled, the light's Intensity is in units of lumens, where 1700 lumens is a 100W lightbulb. When disabled, the light's Intensity is a brightness scale.