Exposure Lights

TraceR Mk4 ReAKT

Exposure Lights TraceR Mk4 ReAKT is a compact, high-output rear bike light built for riders who want standout visibility in fast-changing road and urban conditions. Its ReAKT technology boosts intensity automatically under braking and adjusts output to ambient light, helping the light stay conspicuous when moving between street lighting, shade, and bright sun.

• ReAKT brake response - Automatically flares brighter under braking to make speed changes more obvious to traffic and other riders
• Adaptive brightness control - Intelligently adjusts to surrounding light to maintain strong contrast and day-to-night visibility
• Peloton Mode - Detects a following rider’s front light and dims to reduce dazzle in a paceline, then returns to a brighter output at the back of the group
• Up to 200 lumens - High peak output for a rear taillight suited to commuting, road riding, and time trial use
• CNC aluminum body - Lightweight, rigid housing designed for durability and consistent alignment on the bike
• USB-C rechargeable - Fast, modern charging with a stated 90-minute charge time for quick turnaround between rides