As mentioned, workflow ala Kat fusion glow, or after effects, you can´t really go wrong with that.
But.I can´t help but experimenting with "odd" workflows.
As I mentioned before, experimental evee bloom, which in essential renders in realtime, and easy to set color as you like per instanced item if you wan´t too.
samples of ico spheres instanced on to a box vertices, high values of emission strength and bloom active of course, render out separate bloom pass is what you can do.
but you need to set pull down the alpha on each surface for the object carrying the instances, or some other cryptomatte checking which I yet have to discover.
But this way I got it to work as I want to, the bloom "glow" is obscured by the item it is instanced on as it should be, and I can render out this glow as a single pass only, and then use cycles, or eevee, or Lightwave to render the object itself if I set up the alembic scenefile to match perfectly, once exported to blender.
You can´t save out the bloom pass on transparent film in blender, it will only bloom/glow on the parts that aren´t transparent, so it has to be black.
Use screen in after effects, crush the levels further with color range keying.
Sample below is a shrinked render pass layer,which you shouldn´t do really..it would yield wrong color overlay if it´s not covering the full plate, but I was just testing.
And this is how far I have gotten during all the years trying to model a spaceship
and my understanding of perspective.
bloom/glow pass is linked to the object render pass in after effects, so you can move or scale it without those two layers having a missmatch, but as mentioned, you would want to try and match layer size and background plate with proper scale and position from the start.
eevee bloom, Realtime, and full color control per instanced item on objects.
Experimental but it should work to mix with lightwave renders for objects, then mixing bloom from render blender emission surfaces, instances etc.
And you get distance sizing of the bloom nicely correct.
