Emissive material only visible to Lumen (invisible in game)

Is there a way to create emissive objects that are visible to Lumen but invisible in game?

I’m looking for a way to provide additional soft lighting through windows/openings without using light sources.

I get the look I want with a plane with an emissive material assigned, but I want that plane hidden in game. Is this possible?

5.1 Added AffectIndirectLightingWhileHidden. Release Notes.

Added an AffectIndirectLightingWhileHidden property to the Primitive Component, which allows hidden primitives to be injected into Global Illumination (GI) and Reflections. This is useful as an extra art direction tool to create cheap invisible area lights through GI.


anyway to hide emissive objects reflection?