See also: Lupine Betty, Wilma, Piko Bike Lights
I’ve used Lupine Lighting Systems lights for well over a decade now—best stuff you can buy—still riding the 4500 lumen Lupine Betty R (I have 3 of them!) which has been improved but even now a decade later remains the best light on the road that I’ve seen*, being brighter than many car headlights.
* I’d love to have the Lupine Alpha, which ups the brightness from 4500 lumens to 8100 lumens!
Daytime, I run the light and this has more than once caused a car to lurch as the driver sees me and instead of running into me stays instead in the driveway or similar. Always ride with a BRIGHT front light anywhere where traffic comes in from the side.
If you think you have a "good" LED light on your bike, think again—most of the stuff I see out there is garbage—too dim, too blue, poor beam spread, etc. Particularly ebike lights. With my Lupine lights on high on narrow roads, trucks have backed-up for me more than once and I can ride a twisty descent at 30 mph no problem.
A top-grade light is insurance. A mediocre one is better than nothing, but your life is at stake.
There are very few places you can buy Lupine lights. Here’s one:
Get your Lupine Lighting Systems stuff from Shane at https://www.runbikelight.com.