My standard halogen lamp ranges in the illuminated city while completely out, is when unlit paths but only provisionally useful. I also need a new halogen bulb, which is annoying and expensive 2 to 3 times a year. So LED. I opted for Trelock instead B & M, because the bulb is screwed directly behind the brake system and the space-saving Trelock-sheet appeared as the holder of the B & M. Installation with hub dynamo was easy. The fixture holds what it promises: Super luminous efficiency, no comparison to Halogenfunzel. Automatic functioning properly and the status light is so bright that I can push the wheel well in the dark hallway.