A large percentage of automobile-bicycle collisions occur when a car hits a bike from behind. The UK-designed SureLight bicycle tail light was made with this in mind, as it actually warns motorists when they’re getting too close.
Featuring a water-resistant body that’s milled from a single block of aircraft-grade sandblasted/anodized aluminum, the SureLight automatically powers up when attached to an included magnetic mount on the bike’s seatpost. Its array of 22(!) red LEDS then remain steadily illuminated until the light is pulled off again.
As is the case with many other modern bicycle tail lights, the SureLight also contains an accelerometer that detects when the bicycle starts suddenly slowing down. When this happens, the red LEDs temporarily get brighter, serving as a brake light.
Additionally, however, the SureLight also incorporates a rear-facing proximity sensor. When this device detects that a vehicle behind the bike is getting dangerously close, it triggers