Are there Dynamo powered, rear flashing lights? I run a SON hub dynamo and have recently upgraded my front light (the old light and the dynamo are ~10 years old). The new one is much brighter than the old and has a USB outlet for charging stuff, so I'm very happy with that (Lumotec Eyc).

What I want from a rear light is something like the "superflash" red LED lights, but any kind of blinking would be acceptable. Ideally I'd like one that has both constant and blinking LEDs but I have enough power available to run two, so I'm willing to keep my existing light.

I run my dyno lights constantly, day and night, so having an "off" switch is not necessary (and slightly undesirable), I'd be quite happy with a light that simply flashes whenever power is applied.

But with much searching I have not been able to find anything. I am specifically not interested in the "reelight" things, they will not work for me (and I recommend against them in general, they flash too slowly and too dimly). This thread on bikeradar didn't turn up anything. I suspect part of the problem is that blinking bike lights are not legal in Germany, home of all the good bike light manufacturers.

But I would love a link to one that I can buy, if anyone has one.



(edit in comments) People suggest I DIY, but this question arises from my attempts to DIY. I have built my own bike lights before, and it's hard to make something robust and reliable. Waterproof is a particular issue. Since the original question I have run a light designed for two AAA batteries off the rectified and smoothed dynamo output for a couple of months. Despite my efforts to seal around the hole where the wires went in the light failed after about 3 months of winter riding.

I'm currently running the SeeSense motion sensing battery light and liking the fact that I only have to touch it when I take it off to charge it - it goes into standby automatically when the bike isn't moving. But if I charge it, it stops flashing and has to be manually turned on once charging stops. So I can't possibly use that as a dyno powered light.
I have an Origin rear light and I've seen that it can be charged via usb and also have the lights on  at the same time. If you want to have it powered by a Dynamo, what you could do is have the Dynamo connected to it the whole time on the bike and be lighting at the same time. That could be a way to pull it off and never have to take it off. Also, if you have daylight, the lights could be off and charging so you can use it when the night comes. Good luck.