Sport DirectTM Bicycle Bike Cycle Dynamo Front Halogen Headlight 10 Lux Conforms to British Road Traffic Standards BS6102/3 and StVZO German Road Traffic Standards

For $10 I guess it's fine. It makes a lot of dispersed light, quite visible on the road. However, for some reason the (+) input connects to the fixture, which means that the positive pole is connected to the frame. That's a problem because I have a single-pole bottle dynamo, which uses the frame as the negative pole. So when I connected the negative inlet to the frame, it short-circuited and didn't light (nor did my rear light work). The only way I found around this was to fasten the light to the fixture with some duct-tape. I don't know how long it will hold. Anyway, if your dynamo has two outlets, it won't be a problem.