How to show light rays from an emissive color?

Development Rendering
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1

I’m developing a material and I want to make it look like these lights:

http://static.panoramio.com/photos/original/30767550.jpg

How can I create that effect? Using a bloom dirt mask?

2

Light rays come only from a directional light in UE4, so the only way to hack light rays for this scene is to attach a directional light to your camera and make it point towards the camera. Not sure if it will give you likable results.

You might be better off using lens flares. Lens Flare | Unreal Engine Documentation

p.s. Bloom dirt mask is for camera lens dirt/imperfections.