Hi again.Why does this box looks like its made of translucent plastic (LPV enabled)?
LPV is a non-production ready feature at the moment. It’s still being developed, but has not seen any significant changes due to other priorities. Things like this are known issues that will be dealt with when Epic is actively developing this feature and brings it to a production-ready state.
Also, check the documentation here: https://docs.unrealengine.com/latest/INT/Engine/Rendering/LightingAndShadows/LightPropagationVolumes/index.html
You may be able to make some tweaks in the post process settings to get better results.