Just an FYI to whoever may care. The Magic Shine 900 helmet mount can be flipped upside down and fits up in the seat rails. The light mounts to it (obviously) pointing back. It works awesome as a taillight. It was bright enough that I was pissing off drivers so I had to put a clear colored plastic over the lens to dim and diffuse it.
Some guy in a Mercedes pulled in front and stopped today and as I tried to go by: "WHERE'D YOU GET THAT TAILLIGHT!!!" He yelled. He loved it, copied down all the info on it.
Right now I'm using a couple pieces of that green plant/vine tying stuff as a diffuser, so it's a green taillight. I'm going to try the vehicle brakelight repair tape so it'll be red.
About two months now and it's been great, cool weather, used only on flash mode and no sign of getting too hot. On steady high it may overheat it.
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Thread: MS 900 converted to taillight.