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@Clockwise
I did the dynamo on 2 battery packs adjusting the brightness as needed while riding, with it on medium for most of it(nice summer night). I think about 3-4hrs per pack seems right and most info online agrees.
5000 lumens is awful internet marketing at work, it's about 800 lumens on high and 300 lumens on low (which is plenty and even on low is more than most) but obviously with that cheap marketing spin on everything the numbers keep going up.
Got a couple of these arrive today to add to my cheap chinese light collection on wheels. Satisfyingly large area they cover as the body is wider than the usual seatpost strip. Not using the side lasers atm as I can't tell if a signalled "lane" that's debatably narrow is something I want.
http://www.ebay.co.uk/itm/271700654584?_trksid=p2060778.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT