Roxim X4 LED e-bike light
400 Lumen ebike light with wide 6-85V input range. Has 5.5mm DC jack to power directly off your Grin Cycle Analyst, ebike batteries via a splitter. Features a handlebar switch, a fender mount attachment, and uses reflective optics for StVZO compliance so that all the light shines on the road and not into oncoming traffic.
Does not work with 2020 Rad bikes, because it draws too much power from the stock controller. It could be wired into the harness between the battery and the controller if you are handy.