Except for road & track racing bikes, our bikes are all dynamo systems. Lights are all LED, mostly B&M though we have two Phillips headlights. I prefer Shimano hub dynamo's (on 5 bikes) but two bikes have AXA bottle dynamo's that work well.

B&M Eyc headlight and Toplight Line Brake plus hooked up to a Dymotek 6 sidewall dynamo. Ultra reliable, no batteries, cost about $175

Marc