Hey Vaelek, I am still wrestling with a blueprint version of the lightning flash. It is taking me longer than I expected, I have been running into odd issues with my blueprint/dynamic material instance relationship. It seems the changes in my blueprint will only affect one emitter within my cascade system(even though each bolt uses the same mat instance), so I will need to separate each part into a separate system. Unfortunately I need to jump onto another project here at SG so my lightning blueprint will only get pecked at during my breaks etc.
For the moment, I would recommend duplicating your lightning particle system and disable the light in your duplicate. Then when you enter a structure switch from the original emitter to the non-light generating emitter. I will let you know when the blueprint lightning update is ready. 
