Over Summer I've been running dual 2013 Diablo Mk4's on my helmet, complemented by a MaxX-D on the handlebar. Night MTB has never been as much scarey fun!

I've written up a review of the 2013 Diablo Mk4 along with a few other Exposure bits and pieces
2013 Exposure Diablo Mk4 Review: Own the Night | Digital Hippie

2013 Exposure Diablo Mk4 Review, also includes MaxX-D and Exposure accessories-bikebox-own-night-master-flat-sml-800.jpg