Bryton Gardia R300L rear bike light and radar

To ride safely amongst other road users, cyclists must be as visible as possible with a rear light, such as this Bryton Gardia R300L, which will meet your expectations and more. When paired with a compatible GPS device or a smartphone with the Bryton Gardia app, this radar displays the distance of approaching cars within a range of 150 metres. This radar will then become your best ally in warning you of potential danger, as visual and audible signals will alert you to the approach of a vehicle.

This Bryton Gardia R300L will also help you be clearly seen by other road users thanks to its rear light system. This is designed to catch the attention of motorists from up to 1.6 km away in broad daylight. There are several lighting modes, with brightness levels ranging from 0 to 73 lumens, ensuring you remain visible whatever the conditions. The light automatically adjusts to the weather via a sensor to ensure the brightness is as optimal as possible. This Bryton Gardia R300L also features a brake light using a G-sensor. It alerts vehicles approaching from behind to any emergency braking to reduce the risk of collision.

This Bryton Gardia R300L is compatible with all devices that can connect via ANT+ or Bluetooth, such as Garmin cycle computers. The USB-C rechargeable battery is convenient and offers a good battery life of between 24 and 8 hours, depending on usage mode. The remaining battery life is clearly displayed on your device’s screen to prevent your light from failing mid-ride. This product is easy to install with an elastic strap that fits all seat posts. In short, the Bryton Gardia R300L is sure to suit all cyclists looking for safety.

Technical specifications:

- Dimensions: 40.0 mm wide, 97.0 mm high, 20.9 mm deep
- Weight: 66 grams
- Lighting modes: High Intensity (8 hours, 20 lumens), Low Intensity (12 hours, 5 lumens), Day Flash (17 hours, 73 lumens), Night Flash (17 hours, 12 lumens), Group Ride Mode (11 hours, 12 lumens), Light Off (24 hours)
- Water resistance: IPX7
- Beam angle: 220°
- LED indicator: ANT+, Bluetooth
- Brake light
- Visual and audible signals to alert vehicles
- USB-C charging
- Brand: Bryton

FAQ – Questions / Answers:

- What is the actual detection range of the Bryton Gardia R300L radar?

Up to 190 metres according to Bryton. In real-world conditions (straight road, not too much traffic from the side), most users report reliable detection of 150 metres or more for approaching vehicles. Multi-vehicle detection (up to several simultaneously), with automatic threat level assessment (relative speed) and directional display on a compatible cycle computer screen.

- What is the actual battery life?

This Bryton Gardia R300L offers 6 lighting modes. In daytime flash mode (73 lumens), it offers a battery life of up to 17 hours. Night flash (12 lumens): 17 hours. Peloton/group ride (12 lumens): 11 hours. High intensity (20 lumens): 8 hours. Low intensity (5 lumens): 12 hours. Radar only: up to 24 hours.
In mixed use (daytime flash + radar), expect around 11–14 hours of battery life. Full USB-C recharge in 3–5 hours. Automatic brightness reduction when battery is low. Sleep mode after 5 minutes of inactivity (with light mode saved).

- Is the rear light powerful and visible enough?

Yes. Thanks to the high-brightness CREE LED, the daytime intermittent flash mode is visible from up to 1.6 kilometres away. Automatic braking (g-sensor): switches to intense red brake mode during deceleration or emergency braking.

- Which cycle computers/devices is it compatible with?

ANT+: speed sensor + light profile (light mode control on some models).
It is compatible with almost all modern cycle computers: Bryton (Rider series, S-series), Garmin Edge (830, 1040, etc.), Wahoo ELEMNT (Bolt/Roam) and Hammerhead Karoo.

Bluetooth 5.0: smartphone (dedicated Bryton Gardia app – visual/audible/vibration alerts without a cycle computer).

- Does the brake light work well?

Yes. The built-in accelerometer detects deceleration, triggering a flash or increased brightness. Reliable for normal and emergency braking. Improved via recent firmware updates (fewer false positives).

- How do you mount the Gardia R300L?

All-in-one system: Aero-Mount (standard).
D-shape-Mount (round seat post).
Central quarter-turn (sturdy, but not natively compatible with Garmin).

- Is it waterproof?

Yes. It offers resistance to water ingress up to 1 m for 30 minutes (IPX7 standard). It withstands heavy rain, but prolonged immersion or high-pressure cleaning should be avoided.