The easiest way will be to just delete the light modules + add 1 point light to the fire (either player it or create a blueprint with the fire and add it there) -> you wont get the flickering effect + you will get a better performance 
The easiest way will be to just delete the light modules + add 1 point light to the fire (either player it or create a blueprint with the fire and add it there) -> you wont get the flickering effect + you will get a better performance