Hi, I've looked at Busch and Muller lights, and used to have a B&M rear LED on my old bike, but it was nowhere near as bright as the 1/2 watt Smart lights. I can't find any information on how bright the B&M rear lights are, no lux measurements, and I can't find any reviews of them, at least, none that compare them to a 1/2 watt Smart light (which I had cobbled together to work with my new bike's dynamo, but I managed to break one of the very fragile solders I had made onto the circuit board near the LED, and it died). Are there any rear LED lights which use LEDs of comparable brightness to the Smart ones? I am thinking about buying a 1 watt Smart light, I didn't think they could get any brighter, but apparently they can! I may be able to wire it to my dynamo again, but it obviously means the light can't be used with batteries nor sold on, as it will have a hole in the bottom of the case for the cable to go through (once I've drilled one!).