I'll bring a spare HID light should anyone need one, its plenty powerful enough and has a long battery life (if a tad bulky). Only suspect item is that the lamp holder may get a bit loose in use, I ended up gaffer taping it down at the recent ser2rise as it kept on shining in my face not the trail :shock:
I'd be using it myself but saw a Hope 4 led going cheep (ish...) on ebay and fancied a more lightweight unit for normal night rides.