World Illumination with Lightning?

Hey all,

I am trying to make a lighting flash that Illuminates the entire map when a seperate Blueprint is activated that produces the actual Lightning strike and sound. What type of light would be used for this? and how would i set it up , as well as make it generate with the same timing as the stike ?

Directional light is global. I think perhaps you could use a postprocess volume to make some kind of lighting effect as well.