Be sure to read rm-rf's link above.

I've been really happy with Coast products. You're not going to get any bicycle specific products, but you could take something like the HL7 focusing headlamp and rig it to your helmet. You'd be able to use it in camp and for other uses. I use mine for backcountry skiing.

I have some bicycle specific headlamps, but to get that type of battery life, you're going to be looking at less lumens or a large rechargeable battery pack. I bought this low quality light on sale and have been using it to commute to work. Mine has been fine, but reviews indicate some have got a lemon.