While it’s quite impressive what lumen is able to faciliate at the moment, lumen’s interaction with Niagara is quite, quite strange. It can pull light from screen-space, but Niagara fluids don’t propagate world-space lighting, and it’s not exactly clear if they could ever do that. Tracing rays into an emissive volume and hooking that up to the surface cache is probably a bridge too far for lumen. Likely more than what you needed to hear, but that’s just a bit on it.
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