Hi, Just bought & instaled A Bush & Muller bottle dynamo & B&M Lumotec IQ Cyo Plus LED light, Wow! what a great light. I was expecting a bit of a hum from the dynamo but this thing screams, it rather spoils the tranquility of my night time commute. I have around 10ks of unlit country roads so I supose I won't get to much trouble from wild animals diving under the front wheel cause they can hear me coming from a long way off. Maybe the solution is to go for it & buy a hub dynamo. But I can thorughly recomend the Lumotec IQ Cyo, it's a very powerful beam & gets to full power early at slow speeds.