Moon Helix Sense 300 Rear Light: Brake Sensing, 70-Hour Runtime (£37)
The Moon Helix Sense 300 is a rechargeable rear bike light that brightens when you brake, on sale at Tredz. We have not tested it. This page collects what Tredz lists and the current price.
Available now: Moon Helix Sense Rear Light 300 Lumens — £36.99 at Tredz (listed RRP £54.99), correct at time of writing, 29 October 2026.
What the retailer lists
- Output: up to 300 lumens (FL-1 tested) from a COB red LED, with a runtime of up to 70 hours.
- Sense mode: automatic brightness sensing, a braking light, motion sensing and a parking mode.
- Group rides: a group ride mode so it does not dazzle riders behind you.
- Modes: five, including day flash, steady, flash and two constant modes.
- Build: CNC aluminium heat sink casing, IPX7 water resistance, 35 g, 22 x 19.5 x 66 mm.
- Charging: built-in Li-Po battery, USB Type-C, about 2.5 hours to charge.
Where it fits for triathletes
The points below are our reading of the listed features, not test results.
- Winter road miles. Brake sensing and day flash suit group rides and dark commutes. The runtime and lumen figures are Moon’s FL-1 tested numbers, not ours.
- Price. At £36.99 it is £18.00 below the listed RRP.
- Price. At £36.99 it is £18.00 below the RRP.
Where to buy
Tredz lists the Moon Helix Sense Rear Light 300 Lumens at £36.99 at time of writing, and the link below goes to the same product page.
Related guides
See also the Lezyne Laser Drive 250 rear light review, the Garmin Varia RTL515 review and the Moon Canopus Pro front light review.
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