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We can see that light. Those of us within the Empire of the Eye can actually see it. The Astronomican reaches even to our purgatorial exile, and to us it is no mere mystical radiance illuminating the warp. It is pain, it is fire, and it plunges entire Neverborn worlds into war.
It would be a mistake to believe the Emperor’s power battles the Four Gods’ forces, here. It is not order against chaos, nor anything as crude as ‘good’ against ‘evil’. It is all psychic energy, crashing together in volatile torment.
Most of the Radiant Worlds are uninhabitable, lost in the lethal crash of conflicting psychic energies. Armies of fire angels and flame-wrought projections wage war against everything in their path. We call this region the Firetide. What made the Avernus Breach so valuable was its path, not its destination. It cut through the systems forever bleached bare of life by the Firetide, and into the calmer Radiant Worlds beyond. These are the star systems bathed in psychic light without burning in it.
Entire centuries will pass without a single vessel sailing the region, for it offers little to us beyond yet another example of soul energies manifesting in ways mortals can barely control. On more than one occasion the Mechanicum has sought to use Neverborn spirits bound within arcane flesh-machinery to record the Radiant Worlds in an ever-shifting, evolving map. Such attempts have fared as poorly as you might imagine.

So, does anyone know anything about painting ghosts like they are made of fire? Anyone make any daemons of the Emperor/astronomican? Any thoughts about Talon of Horus and the Firetide region of the Eye of Terror? Flaming Angels constantly at war with daemons?

I am thinking sigmar ghosts of various sorts + fire color + stormcast wings on bigger more angelic models = Firetide. Any advice?

I've painted fire before similar to the ghosts in the second image. I think that's the way to go if you want a fire effect, with a bright yellow center and the edges cooled down that it's almost black. I wouldn't go full black unless you have actual smoke on the model as it's still part of the fiery portion of the model, so there should still be a fiery color there. I've used both a red and an orange wash over a black base to tint the darkest parts accordingly. I prefer how it looked with orange.

I'd avoid the approach the spoilered one takes. In my experience painted fire works best if you have a hot, bright spot or line to center the fire effect on. Trying to apply a wide, swirly effect is hard to do convincingly (or maybe I'm just not good enough or what looks convincing).

Using the right model can help a lot. I think Spirit Hosts are really good for fire ghosts because they only really have one focal spot with the rest of the model made up of swirly crap. Basically that's what fire looks like. It's much harder to pull off overlaying a fire effect on a model with its own distinct shape.

Don't know anything about the Horus Heresy, though, so I can't help with anything else.