Serfas USL-500 E-Lume 500
We really like the Serfas commuter lights here at the Co-op. The E-Lume front lights are really well thought-out for everyday use. They have mounting brackets that rotate so you can aim the beam no matter what shape bars you have, and are easy to move from bike to bike. You can get spare mounts to make it even easier. Serfas commuter lights also have some of the best lumen outputs in the industry for every price level, and a great lifetime-limited warranty.
Here's a copy paste from their website: These headlights will meet and exceed their expected lumen output while offering you all the features you’ve come to enjoy from Serfas lighting. Please welcome the new line of E-Lume Series lights, and be prepared to turn night into day.