Ask Epic Anything: Lighting in UEFN | August 24, 2023 at 11AM ET

The light renderer creates a light at each position. Its effect would be to light other things. It can be used either at the emitter level (one per emitter, most common, say the core of an explosion) or per particle.
The lights are considered “Simple Lights” and are cheaper than a light component and mostly cost overdraw/pixel fill and don’t typically cast shadows. They also typically don’t have exponental falloff which bounds their radius of pixel influence better than inverse square.
The feature needs to be used with care since it can quickly get expensive and the guidance is always to use sparingly.

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