Have been doing some research on this. Amazing how old this is. They're just now releasing this with a bike mount aimed at the bicycling market, but it's essentially the exact smae thing. Retails for $40 MSRP. Am waiting to get my hands on one for testing. Have been waiting for the bicycle industry makers to respond to these inexpensive high efficiency brightness LED lights. Seems like this is the year. I've been using various relatively inexpensive 100-180 lumen LED headlamps that use AA and AAA for touring for for 2-3 years now. The brightness levels and adjustable beam seem ideal. I find it impossible to believe it'll get anywhere near 4 hours at 220 lumens. If it does that would be incredible. Love that it's completely waterproof and self contained. Awesome little package for summer touring... though for winter battery packs need to be external so they can be kept warm. Only comes with a handlebar mount, but shouldn't be to hard to creat a headlamp mount.
Hope it isn't to heavy. Am thinking of mounting one on my handlebar and one on my helmet. Depends on the weight though.