I ordered 3 Ultrafires from Dealextreme.com. It took FOREVER (18 days) to get here, so I also ordered 2 Fenix L2D lights for comparison while I was waiting. I have ridden once at night with one Ultrafire, and it worked pretty well. For max lighting I plan to put two on my bike and one on my helmet. Otherwise I could probably get by with one on bike, one on helmet.