How tedious, another lighting flame war. I don't understand why battery vs dynamo inspires more hatred than Sramano vs campy or steel vs carbon etc.

Anyways, I got a cheap magicshine knockoff from Amazon, I don't really like the beam pattern, I find it too narrow even with the extra spreader lens.

However, I really really like my CREE XML T6 Zoomable-head flashlight. I think it was $22 when I got it (including charger and batteries), it's cheaper now. It's big and heavy, but it mounts quite securely with two interlocking hose clamps. The original pair of 18650 batteries were crap, I paid like $10-15 to an american website for more reliable batteries and the originals live in my seatbag as backups. It is so bright on high I just run it on medium, or sometimes I'll run flashing at dusk. In the darkest time of the year a full charge will last me a week (~30min each way x 5 days ~ 5 hours?) I can slide the zoomable head to get a beam width I like very much; good width at the 20-40ft forward distance I want to focus on, and very little light bouncing off of street signs or stop signs or even parked taillights.