I need to change the way the sun is drawn so it works properly with the bloom. Hoping to see some daylight results today.
The way I've done it depends on HDR because I'm not using a threshold. The amount of bloom I set very quickly without thinking about it much. The car headlights don't yet have a surface brightness related to their beam strength so I guess that's why their bloom doesn't seem very bright.
About the method you originally mentioned with a link to GitHub, I couldn't get much information from GitHub but your description led me to this method described by Jasper Flick:
That's basically what I've done. Is that the same as the method you were talking about? I was surprised not to be able to find any other descriptions on the net.