Bests & Worsts Reviews from Amazon

On the left is this product, and on the right is the Planet Bike Superflash. The Planet Bike Blinky Super Flash Tail Light has been the gold standard for many years. It had a single half watt LED and two additional less bright LEDs that flash using a flash-pop arrangement that keeps at least one lamp lit almost all the time so that drivers of cars can always see it. Off axis visibility was good, so that it didn't have to be aimed directly at the driver. It was waterproof and you could drop it repeatedly without breakage. I own several of them and have been very happy with them. But they suffer from a few shortcomings. First, they have a short repeat sequence. Drunk and high-on-drugs drivers can get mesmerized by such a sequence and will run right into a light like this like a moth to a flame. So I've been using the superflash on the sides, not the back. Second, they are very bright up close, but from a distance, with lots of other distracting lights, they get lost in the crowd. A half watt isn't very bright when there are many other 12 volt sources of light. So in a big city, they are less effective. Enter the Portland Design Works Danger Zone. It has two half watt LED that punch through the clutter of other lights in a city, and a longer repeat pattern making a drunk driver less likely to hit you with one of them. You can see from the video that it seems much brighter, though if you stop the video right at the end, both lights have a single half watt LED on at the same time and you can see that, at least at that moment, they are both identical. Otherwise, it seems well built, waterproof and off axis visibility is just as good, just like the superflash. Clip and mounting capabilities are almost identical. It's a little bigger than the superflash. However, the brightness comes with some drawbacks. First, the battery life will go down. Second it's more expensive. However, I think for a rear light, it's worth it. For a side light (I use one on each side for drivers exiting driveways and parking lots, and cross traffic), I'd stick with the superflash, due to cost and battery life issues.