Neither the HE500 nor the LCD2 are bright, I felt the LCD2 to be a "bit brighter". This doesn't make it a bright set. Certain tracks that were sibilant and a bit hissy on the LCD2 ended up playing more smoothly through the HE-500. I think the LCD2 highs have more snap and bite to their highs but are still far from being considered bright, to my ears the Audeze was a bit more harsh in the highs on certain tracks known to be sibilant.
I seem to have a unique view on pretty much everything, I just don't hear some of the things people are talking about when it comes to highs. As Ardilla said, most users find the LCD2 to be less bright. It is a close call but I am taking a stand on the opposing team with regard to the high experience. The LCD2 is pretty much brandished as a highly engaging rock, metal and face paced music set of Orthos, where as the HE500 is the smoother set. The brighter highs are usually found in sets regarded for being highly engaging with rock or fast paced genres, which is really the absolute definition of what the LCD2 is. I just don't see how the HE500 would have brighter highs if it is without question the more tonally balanced and smoother sounded, more relaxing set.
Don't take my impressions to heart, they are just my impressions and you need to judge for yourself, both sets are just fantastic and absolutely amazing in their own special ways.