That's what they call lens flare. Learned that from here too. Haha
I learned about lens flare from watching J.J. Abrams' Star Trek (2009).
Is it worth another Genius Bar appointment
I got this also with just the normal lamp in the bathroom and the other pic is with a brighter halogen bulb for my reptile. If you can't recreate it then I'm thinking it could be a problemIt's normal I think. I tried to test it on my iPhone 6 last night but I didn't get the flare. Idk if my lights weren't bright enough to cause the flare or not. I know flaring is the issue in your photos but if it's normal to the iPhone 6 idk for sure. I remember using cameras before and having the flare and it being normal. It wouldn't hurt to keep your appt just to be sure as I am not an expert.
There's nothing they can do about it. Maybe someone makes someone out there makes a lens hood for it though to minimize it.Is it worth another Genius Bar appointment
I got this also with just the normal lamp in the bathroom and the other pic is with a brighter halogen bulb for my reptile. If you can't recreate it then I'm thinking it could be a problem