My camera has strange reflection of light in the lens

Same here. It's not defect with your phone, it's a defect with all of them. Add it to the list of things that Apple needs to fix before the next iPhone model. Basically any source of light in the frame causes this. I think it could be fixed with a software update to the ISP but I'm not holding my breath. The iPhone 6 is the most disappointing Apple product I have ever purchased.

Then return it or sell it. None of the iPhone 6 units I work with has this kind of issue. It's not a 'defect with all of them'. How utterly ridiculous.

Maybe defect is not the right word but I would venture to guess, considering that it's present on all iPhones I have access to (albeit a limited quantity), and because my camera is functioning normally otherwise, that this is happening because of the lens design or because of the current software and exchanging the phone will likely not help.

That's not for you to decide. That's between Apple and that customer.

And these are pictures taken in poor quality light. And every cell phone in the world has, to be honest, an inferior camera to an actual camera. You're never going to get the same range of capabilities in a cell phone camera as you would in even a small point & shoot digital camera.

I have decided nothing. I merely said that exchanging it will likely not fix the problem. Can you take a picture with one of your dozens of perfect iPhones that will not produce a similar reflection when shooting a bright light source in low light? If so, can I buy one?

No, these are company iPhones, not my personal units. The OP should take it to an Apple Store for testing and evaluation, and so they can determine whether this is normal operation or not.