how to combine blender internal and cycles? How can we combine the two render engines to make one scene affect the other? Especially, since cycles doesn't do halos, how can we make it so that the halos created with the internal, enlighten a scene in cycles? For instance, if we created a bunch of firefiles rendered with the internal and have to make it so that a room rendered with cycles have to be enlightened with the fireflies, how do we achieve it?
You'll have to render every image two times: one in Internal and one in Cycles, and then combine them in the compositor, using transparency instead of sky for the overlay images (and series of PNG's as format).