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Moon Helix Sense (450lm) Rear Light

• 450 Lumen Maximum Output - High-intensity brightness for maximum visibility and safety in all conditions

• Intelligent Sense Mode with Braking Light - Automatically detects deceleration and increases brightness to alert following traffic

• Automatic Brightness Sensing - Adjusts light intensity based on ambient conditions for optimal battery life and visibility

• Parking Mode - Activates a low-power flash when stationary to maintain visibility while conserving battery

• Group Ride Mode - Specialized setting designed for riding in groups to avoid dazzling other cyclists

Brand: Moon

Type: Rear

Availability: In stock Out of stock

Delivery: 2-3 working days

Product variants

Regular price: £44.89
Sale price: £44.89
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Description

The Helix Sense 450 is quite possibly the brightest and most feature packed rear light ever made. The unique Sense mode includes a braking light which increases brightness when slowing down, brightness sensing which automatically switches between daytime flashing and night mode and parking mode which automatically turns the light to standby mode when no motion is detected. In addition, the Helix Sense 450 also has a group ride mode to allow you to be seen on group rides without dazzling your riding friends.

Specification

COB red LED

Max. Lumens: 450LM (FL-1 tested)

Max.Runtime:100 hrs (FL-1 tested)

Battery Type : Li-PO built-in

Recharge Time: 2:30 hrs

Size ( W x D x H): 22 x 19.5 x 81 mm

Weight: 40g

Features

5 modes: DAY FLASH / STEADY FLASH / FLASH 1 / MODE 1 / MODE 2

CNC Aluminum heat sink casing

SENSE Mode

Brightness function

Motion sensing function

Braking function

Parking function

Lock Mode

Auto safe mode

Day flash mode

Mode memory function

Variable Lumen System

Low battery, charging and fully charged indicator

Automatic fully charged cut-off system

Side visibility

Water resistance (IPX7)

Rechargeable lithium polymer battery

USB Type-C charging cable

Shipping & Returns

Our Promise

All orders are carefully prepared and dispatched within 1-2 business days. Once your package is on its way, you will receive a confirmation email with a tracking number so you can follow its journey.

Same‑Day Dispatch

Orders placed before 2pm are dispatched the same day via Royal Mail Tracked 24.

If there are any stock issues, we will contact you by phone or email to update you and reorganise delivery.

Shipping Costs

• Orders over £50 qualify for free shipping.

• Orders under £50 have a flat delivery fee of £3.00.

Letterbox‑Friendly Items

Any items that can be delivered through a standard letterbox will be sent via Royal Mail 24 for convenience.

Optional Special Delivery Upgrade

For urgent orders, you can upgrade to Royal Mail Special Delivery Guaranteed by 1pm.

This upgrade is available at checkout for orders placed before 2pm.

FAQ

Q: What makes the Sense mode different from standard rear lights? A: The Sense mode uses intelligent sensor technology to detect when you're braking or decelerating, automatically increasing brightness to alert traffic behind you—just like a car's brake light. This provides an extra layer of safety during rides.

Q: How does the automatic brightness sensing work? A: The light features an ambient light sensor that continuously monitors surrounding conditions and adjusts the output accordingly. In low-light or dark conditions, it increases brightness for maximum visibility, while conserving battery in brighter environments.

Q: What's the difference between the 450lm and 300lm Helix Sense models? A: The 450lm model offers higher maximum output (450 vs 300 lumens) for greater visibility, longer battery life at equivalent settings, and a more robust build. The 300lm version is lighter and more compact while retaining all the same intelligent features like Sense mode, automatic brightness, and group ride mode.

Q: How long does the battery last and how do I charge it? A: The light is USB rechargeable for convenient charging from any USB port. Battery life varies by mode—typically ranging from 2-3 hours on maximum output to 10+ hours on lower settings. The parking mode can last several days on a single charge.

Q: Is the light waterproof and suitable for all weather conditions? A: Yes, the Helix Sense 450 features weather-resistant construction designed to withstand rain, spray, and typical cycling conditions. It's built to perform reliably in wet weather, though it should not be fully submerged.