Lezyne Radar React Light System

The Lezyne Radar React Light System is a two-piece front and rear lighting set built around one core idea: knowing what's behind you before it reaches you. The Radar Drive rear light detects approaching vehicles and sends real-time alerts to three places simultaneously — the React Drive front light on your bar, the Radar Ally smartphone app, and compatible GPS bike computers. No looking back. No checking a screen. The alert comes to you. The Radar Drive does the detection work, scanning for vehicles approaching from behind and transmitting wirelessly to the React Drive up front. The React Drive processes those signals and delivers both a visual flash and an audible tone directly on the handlebar — no phone, no head unit required for in-ride alerts. For riders who want more, the Radar Ally app adds manual control of both lights and a phone-based radar display, and the system pairs with compatible GPS computers for on-screen vehicle warnings. Both lights are custom-programmed to work together as a single wireless system out of the box; a smartphone is needed for the initial pairing, then the system runs independently. The light performance holds up on its own terms. The React Drive front reaches 1,200 lumens with up to 70 hours of runtime — enough output for night riding, enough runtime that charging becomes a weekly task rather than a daily one. The Radar Drive rear puts out 300 lumens with a 20-hour runtime and runs disruptive daytime flash patterns designed to catch drivers' attention before any radar detection is needed. Both lights are IPX7 waterproof and charge via USB-C. Specs at a Glance React Drive (Front) — Max Lumens: 1,200 React Drive (Front) — Max Runtime: 70 hours React Drive (Front) — Weight: 162g Radar Drive (Rear) — Max Lumens: 300 Radar Drive (Rear) — Max Runtime: 20 hours Radar Drive (Rear) — Weight: 144g Waterproofing: IPX7 (both lights) Charging: USB-C (both lights) Alert Delivery: React Drive front (visual + audio), Radar Ally app, compatible GPS computers App: Lezyne Radar Ally — manual light control + radar display Initial Setup: Smartphone required for pairing Design Benefits On-bar vehicle alerts: React Drive delivers visual and audio warnings directly — no phone or head unit needed during the ride. Triple alert pipeline: Front light, Radar Ally app, and GPS computer all receive alerts simultaneously. 1,200-lumen front with 70-hour runtime: Full night-riding output with runtime that outlasts most training weeks between charges. Integrated wireless system: Custom-programmed pairing — both lights work together from the start, no configuration required. IPX7 + USB-C on both lights: All-weather capable, modern charging standard throughout.