Light spot show help!

Hi guys, how are you? I’m creating a show stage in the unreal engine and I’m having a huge difficulty creating the lights, especially a light specifies the “BEAM”, I created it based on FOG but it gets popping up I can not make it look pretty, so I saw the Fortnight event about DJ Marchmello, I saw the stage and I saw this light that I need to work perfectly so I saw that it is possible to create it but I have no idea how, can you help me, I will post two pictures below, one that is what I did and one that is how fortnite is and that is exactly the way I need it, if you can help me thank you very much!
my light on the photo looks beautiful but working in real time it gets popping up, well flawed and ugly.
and as I use it on the go then it crashes quite a bit until it looks like it’s super low fps, creating ghosting
I really need it to be exactly like the picture I’m showing fornite
help-meeee please ;-;