hah, it's very simple. To see bloom from emissive you actually have to blur your lights through Gaussian Blur filter or layer styles (outer glow), you'll get that halo. BUT if you want to plug it in UE4 you SHOULDN'T blur your lights, you have to modify emissisve strength in UE4 material. Blur setup will work with Unity.…
i found this tutorial image: https://i.imgur.com/Ur5iz4H.jpg), but its for udk, is there something like it for ue4? I dont know where its taken from, could be a webpage. for some reason images like that are easier to follow than a webpage though.