User blog comment:Epakrios/Plot holes/@comment-1509826-20140118183926/@comment-5619706-20140118222617

The new way angels are shown is improper. It's basically the demon smoke cgi colored white (but you can see the actual angel wisp is dark, which I suspect is due to how the cg is wired to remain dark and only the edges could be colored white--it happens sometimes in photoshop) and that would only be true for the Grace. I think they're either experimenting with their particle cg (also seen in the ritual that restored Josie Sands), they are being lazy or they are cutting their costs.

Actual angels have been pictured as harsh blinding white light in the past seasons. This is especially true when angels project their true forms, which is accompanied by a bright light radiating in all directions, and not as the grace-wisps.