Thought you guys might be interested in one guy's project which he claims to be able to run continuously at 350 watts. Next time Luke travels to Germany he might want to collaborate on an over-the-top night rider with this guy.
http://www.candlepowerforums.com/vb/showthread.php?344877-49-XM-L-U2-40-000lm-watercooled-bike-lamp
http://www.candlepowerforums.com/vb/showthread.php?344877-49-XM-L-U2-40-000lm-watercooled-bike-lamp