Being seen on the road is rather important, especially when you're sharing it with drivers who occasionally appear to be concentrating on absolutely everything except the cyclist in front of them. The Exposure Lights Boost-R 3 ReAKT takes rear visibility seriously, packing intelligent lighting technology into a beautifully compact design. With an impressive 200-lumen maximum flash output, automatic brake light functionality and a distinctive daytime pulse, it's designed to help you stand out in busy traffic without turning your seatpost into a mobile Christmas decoration.
The Boost-R 3 combines Exposure's clever ReAKT Technology with DayBright and Peloton modes to adapt its illumination to the conditions around you. ReAKT detects braking and changes in ambient light, automatically adjusting brightness to help keep you noticeable. Peloton Technology takes care of your riding companions, dimming the light when it detects another cyclist's front light behind you to reduce unnecessary glare. Add convenient USB-C charging, up to 70 hours of runtime and rugged aluminium construction, and you've got a seriously capable little rear light that's ready for commuting, winter training and long-distance adventures. All that intelligence in just 45 grams. Not bad for something smaller than your average emergency snack.
Key Features
200 Lumens Maximum Flash Output – Powerful flashing illumination helps improve visibility to approaching road users during daylight and low-light riding
75 Lumens Constant Output – Steady lighting mode provides consistent rear illumination for everyday cycling
Exposure ReAKT Technology – Intelligent system detects braking and changing ambient light conditions, automatically adjusting brightness
Automatic Brake Light Function – Light increases its output during deceleration to provide an additional visual cue to following road users
Ambient Light Sensing – Automatically adapts brightness as you move between shade, street lighting and brighter environments
Exposure DayBright Technology – Distinctive daytime pulse pattern is designed to make the light more conspicuous in bright conditions
Over 1km Daytime Visibility – Exposure's DayBright technology is designed to be noticeable from over a kilometre away under suitable conditions
Exposure Peloton Technology – Detects the front light of a following cyclist and automatically reduces output to help prevent dazzling
Automatic Peloton Brightness Adjustment – Returns to a brighter setting when following riders move away, helping maintain rearward visibility
Up To 70 Hours Runtime – Extended battery endurance supports regular commuting and longer cycling adventures
6–70 Hours Operating Time – Multiple lighting programs allow you to balance brightness and battery endurance
1600mAh Lithium-Ion Battery – Integrated rechargeable battery provides dependable power without requiring an external battery pack
USB-C Power Delivery Charging – Modern charging connection provides convenient recharging using compatible USB-C chargers
Fast Charging – Approximately 1.5-hour charging time helps reduce downtime between rides
Portable Power Bank Compatibility – Recharge from a suitable USB power bank during longer trips and multi-day adventures
Optimised Mode Selector – Choose between lighting programs to find the most suitable combination of output and runtime
Intelligent Thermal Management – Automatically regulates LED power when necessary to manage temperature and maintain efficient operation
Precision Rear Light Optics – Carefully designed lens system directs illumination rearwards while providing useful side visibility
270° Commute Lens – Wide-angle optical design helps improve visibility from the sides as well as directly behind
8° Collimated Spot Lens – Focused optical element helps provide effective long-distance rearward illumination
45g Lightweight Construction – Compact design adds minimal weight to your bike
CNC-Machined 6063 Aluminium Body – Precision-engineered housing combines durability with effective heat management
IP67 Water & Dust Resistance – Sealed construction protects against dust ingress and temporary immersion under specified conditions
IK09 Impact Resistance – Robust housing is engineered to withstand demanding everyday riding conditions
Quarter-Turn Locking Bracket – Secure mounting arrangement makes attaching and removing the light straightforward
Compact 60mm Body Length – Small, unobtrusive construction keeps your seatpost setup tidy
Integrated Rechargeable Design – Self-contained battery eliminates the need for external power cables during normal use
Designed & Built in the UK – Developed and manufactured by Exposure Lights with a focus on dependable engineering
The Exposure Boost-R 3 ReAKT is one of those cycling accessories that proves clever technology doesn't have to take up much space. Its automatic braking response, intelligent brightness adjustment and distinctive daytime lighting make it a thoughtful companion for busy roads and everyday commuting. Peloton Technology is a particularly welcome touch for club riders, helping you remain visible without making life unnecessarily uncomfortable for everyone behind you. It's compact, practical and packed with genuinely useful features. If only the technology could persuade every driver to pay the same amount of attention to the road.