It's mostly personal preference. Well, here is something to shut you up. So the pictures that TheGSS and most other ghost hunting groups on the web post would not be a product of light reflecting, because they contain the element of dimension. Lets clear this issue real quick. Lense flare - At least half of the skeptics throwing this word around just like the sound of it, but couldn't pick out an example of lense flare if they had to.
Lense flare is usually a product of taking pictures in the direction of the sun.
Also lense flare most times will show up as similar shaped forms of light, some times in different colors. NOT skued in different areas of the picture. If it was light bouncing off of objects, the light would be stationary, not blurred in a certain direction. It would be a single point of light, without a curved line following the ball of light. It's like action shots in sports.