My opinion comes from being a photographer and an 18 year editor.
I don’t think you’d get a halo from a light at that distance unless the air is smoky or dusty.
When you block a light, you can see the scattered light coming from the cone of particulates in the light’s path (scattering prefers low angles).
If you block the Sun with a street sign or overhead light, you get a halo, but blocking a floodlight outdoors at night you usually won’t unless the light is far away, and there’s an aerosol.
Zoom in on The One’s face, there are saturated pixels under his eye.
Plus, as many have pointed out, where is the light? It is not on a stand or we’d see it, not dangling from a cord. It looks like the light is mounted away from a beam, in the middle of the insulation.
I’m leaning toward a PS job, but done more or less innocently to better define his head against a background.
Oops, I just found a Boston Glob picture with TWO big lights, one making the One’s Halo and one merely glaring:
http://cache.boston.com/resize/bonzai-fba/AP_Photo/2009/08/14/1250279506_5096/539w.jpg
The detail is good enough to see spittle flying. These look like stage lights fairly close, and the “halo” is not as pronounced.
http://www.drwells.org/images_documents/images/Obama_Rally_Bozeman_web.JPG
This shot shows no lights on the walls. A truss in the back, looks like follow spots, and the hangar lights on the ceiling.
It would not be particularly hard to Photoshop that halo. Just use the magnetic lasso to isolate the head and upper body, then select inverse and use the rendering filter to create a lens flare or spotlight effect. There are several other ways I can think of, and I’m not even an expert, just someone who uses Photoshop for my eBay sales.
