I am not sure if this has been mentioned already but rebuilding the lights over and over again for just moving a light or changing a small settings in lights, blueprints takes a lot of time even in preview mode.
It seams right now the only option is to build the entire level lights. It will be nice if we can have the option to build for lights by selected only like it was in previous engines, UDK for example. It save us a lot of waiting time.
It seams many people already ask this question on unreal hub:
But I couldn’t find a feature request for it.
Thank you for your time.