Hey guys, check this out. Upon further evaluation of my 55HX820, I also discovered that I have a decent amount of flashlighting/bleeding from the edges. If the tv was a clockface, the bleeding would be from 6 to 12. Now, let me share what I've discovered.
I popped in a Goodfellas widescreen DVD into my PS3. By default, I have my HDMI2 scene setting set to "Game". While the movie was playing in letterbox, I was able to see the flashlighting in the black areas around the image, and it is somewhat of a problem. So I became a little discouraged about the defect and began to mess with the settings. The first and only step I took was the right one: I changed the scene to Cinema and it completely took the flashlighting away without having to make any other adjustments. Everything around the picture is now SOLID BLACK.
I recommend that you guys try this.