That picture is ridiculous - I haven't been able to replicate it to such a degree.
Check out these 2 pictures - not as bad as other pictures...maybe its cause I don't have a case or something? Straight out of the phone, no crop or enhance. The light is a 60W single bulb and I went for worst case purple halo...
I don't have a case either. I can see the purple in yours, but it doesn't seem to be as bad as mine. I think here is the summary so far:
1. All iPhone 5's have this purple flare/haze issue
2. Some do not have it as bad as others
3. The iPhone 4S also has it, but not nearly as bad
4. I think this will be classified as the purple haze being "far more apparent" than other cameras
In any case, I'm not real happy with mine. Unless I can get a fix, it's going back to Verizon and I'm downgrading to the 4S, where this was not an issue for me.