I haven't even listened to all the songs on the trilogy, to be honest. Maybe I should before I judge the whole thing, but I previewed many tracks and couldn't even listen all the way through because I was so disappointed (mainly with the poor lyrics). We all know they are obviously capable of so much more.
They were released on the "Know Your Enemy" single (which was released on 2 CDs). 1 CD had "Lights Out" only, the other CD had "Lights Out" AND "Hearts Collide" and the vinyl version had "Hearts Collide" as the b-side.