The Firefly can be used as a headlight (white) or taillight (red). Owners of multiple Firefly lights can sync them together.
Owners and testers say the Firefly is sufficiently bright for being seen in urban environments.
The “intuitive” Ride Lumos app offers excellent customization of light modes.
The app shows the charge level of each light connected.
Magnetic mounting allows quick attachment and detachment of lights from their mounts.
An included Velcro strap allows the Firefly to mount to competitor’s helmets and other clothes or gear.
The Firefly can be synced with other cyclists’ Lumos lights or the built-in lights of the Lumos Ultra and Ultra E-Bike helmets.
These lights can be programmed to turn off together, but they must be turned on individually.

5 reasons not to buy

Lumos markets the Firefly for use as brake lights and turn signals, but using these functions requires the purchase of a handlebar remote accessory.
Lumos doesn’t provide the charging bases with the Firefly; these cost extra.
Two owners lose lights after they fall off the magnetic mounts. Lumos provides a clip with each mount for additional security.
Owners say the runtime in taillight mode with brake activation enabled is poor.
The Firefly light alone is pricey, but adding all the necessary accessories makes it very expensive.

Bottom line

The Lumos Firefly is a bike light that works as a taillight (red) or headlight (white). Chargers must be bought separately, and using the brake light or turn signal modes requires purchasing a handlebar remote. Testers praise the customizable modes, varied mounting options, and good visibility. The “user-friendly” Ride Lumos app greatly expands the functionality. Complaints include poor runtimes in brake light mode and two owners losing lights that fell off the magnetic mount. Overall, experts and owners appreciate the Firefly’s high-tech features, but these come at a very high price.

Expert Reviews

80/100 based on 2 scored reviews

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The Sweet Cyclists

Level 1 expert

Lumos Firefly Smart Magnetic Bike Light System Review – Feat. Turn Signals + Brake Sensor + COB LED

Level 1 expert

Overall, we found the Lumos Firefly [lights] to be clever and easy to configure.

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Graine de Geek

Level 1 expert

Discovering Lumos Firefly: The Revolutionary Bicycle Light [French]

Level 1 expert

The Lumos Firefly has far more strengths than weaknesses. While they are a bit pricey and require some reliance on a mobile app, their benefits in terms of security, customization, and weather resistance far outweigh these drawbacks.

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