milestone MS-i2 “Endurance PRO”

Brighter and Longer-Running: the MS-i2, Built for Nights That Do Not End

The milestone MS-i2 "Endurance PRO" is a rechargeable LED headlamp made for night sections in trail running and long-distance efforts.

Built on the previous MS-i1 "Endurance Model", it raises maximum output to 1100 lumens and comes with the 5000mAh MS-LB4 battery as standard. That gives roughly 10 hours at ULTRA HIGH (1100lm) and about 12 hours at HIGH (730lm).

This is not simply a brighter lamp: burn time, on-the-move fit adjustment and battery choice have all been reworked for staying out longer.

Four Natural Warm Colour LEDs

The light comes from four natural warm colour LEDs, a tone milestone designed to sit close to natural light, chosen with night-time trail visibility in mind.

Maximum output is 1100 lumens in ULTRA HIGH. Four levels let you go from throwing light far down a forest road to holding back output over a long night.

Four Levels of Output and Burn Time

The modes are LOW, MID, HIGH and ULTRA HIGH.

LOW gives 100 lumens for about 76 hours, MID 350 lumens for about 19 hours, HIGH 730 lumens for about 12 hours, and ULTRA HIGH 1100 lumens for about 10 hours. You can balance brightness against battery use for the length of the night and the terrain.

The cycle runs MID, HIGH, ULTRA HIGH, then LOW. Hold the button for two seconds to switch off.

milestone notes that brightness gradually decreases from around two minutes after switching on.

Quick-Adjust Band You Can Set While Moving

The headband uses a quick-adjust mechanism.

In trail running the tension that feels right shifts with climbs and descents, with pace, and with whether you are wearing a cap or other headwear. The MS-i2 is built so the band can be adjusted while you are still moving, holding fit through hard efforts.

A top belt is included.

5000mAh MS-LB4 as Standard

The supplied battery is the MS-LB4, a 5000mAh dedicated lithium rechargeable cell.

It carries enough capacity for around 10 hours of continuous ULTRA HIGH output, aimed at trail races and long-distance days where night movement runs from dusk to dawn.

Charging is over USB Type-C. Use the supplied Type-C cable when charging the MS-LB4.

Down to 185g with the MS-LB3

With the included battery spacer you can also run the MS-LB3, the separately sold battery from the MS-i1.

The lamp weighs 208g with the standard MS-LB4 and 185g with the MS-LB3. Choose the MS-LB4 when burn time matters most, or the MS-LB3 when you want to cut carried weight.

The MS-LB4 Doubles as a Power Bank

The MS-LB4 is not limited to powering the lamp: it also works as a power bank.

On long days in the mountains, phones and other devices drain alongside your headlamp. The MS-i2's power source can be turned to charging another device when you need it.

A Headlamp That Lets You Choose What Matters

Over a long night you do not need full output the whole time. You drop the light on climbs and open it up on faster descents; when the day runs long, output has to be weighed against what is left in the battery.

The MS-i2 "Endurance PRO" pairs 1100 lumens with four burn-time levels, a 5000mAh battery and MS-LB3 compatibility, so you can build your own approach to a long night out.

Specifications

Burn times are milestone's published figures. Brightness gradually decreases from around two minutes after switching on.