The P3P and P4 both have Lightbridge !The p3 and 4 get it right. They don't have light bridge but a version of it. The H will retain the 720p through its range.
I did Read somewhere the resolution drops off the phantom the further you fly.
It's only 720p quite close or this is what I read somewhere, but it's not light bridge but a much cheap base on light bridge technology.