Originally Posted by alan s

My standard is to be able to see far enough ahead to avoid hazards on mostly unlit MUPs. My current light setup with both lights on high gives me about 15 seconds of visibility at 18 mph, which is my normal cruising speed on the flats, and way more time than I need to ride safely. This distance approaches 10 seconds at higher speeds of around 25 mph on downhills, and at which speed I need more time to stop or react, and is just enough light to ride safely. Sounds like most of the dynamo lights would be inadequate for my purposes.