Ultra-marathons demand headlamps that are lightweight, long-lasting, and reliable across unpredictable terrain and conditions. Whether you're covering 50 or 100 miles, your headlamp needs to perform as consistently at mile 80 as it did at mile one.

running headlamps

Features to Look for in an Ultra-Marathon Headlamp

  • Low weight: Every ounce counts. A lighter headlamp reduces fatigue over long distances
  • Long runtime: Look for headlamps with enough battery capacity to last when you need it most.
  • Brightness range: Low modes conserve battery on dim sections; high modes handle dark, technical trails
  • Secure fit: A headband that stays put through miles of movement is non-negotiable
  • Weather resistance: IP68-rated protection handles rain, mud, and stream crossings
  • Rechargeability: USB-C rechargeability means you can top off at aid stations or between race segments

Best Fenix Headlamps for Ultra-Marathons

Fenix builds two headlamps purpose-built for trail running that stand out for ultra-marathon use.

Fenix HM62-T Lightweight Headlamp

The lightest option for runners prioritizing minimal carry weight.

  • fenix hm62-t headlamp blackMax output: 1200 lumens
  • Max beam distance: 492ft (150m)
  • Weight: 4.41oz (125g) including battery
  • Runtime: Up to 280 hours
  • Lighting modes: 6 (4 white, red, red flash)
  • Battery: 18650 Li-ion, USB-C rechargeable
  • Construction: Magnesium alloy
  • IP68 waterproof and dustproof

Best for: Runners who prioritize weight savings and all-day comfort on long efforts.

Why the HM62-T is a recommended headlamp for ultra-marathons: As Fenix's lightest headlamp, the HM62-T is specifically engineered to minimize fatigue over long distances. Its magnesium alloy build keeps weight to just 4.41oz (125g) without sacrificing durability, making it a go-to when every gram matters across 50 or 100 miles.

Fenix HM65R-T V2 Rechargeable Headlamp

The endurance runner's pick — 300 hours of continuous runtime on its lowest setting.

  • Fenix HM65R-T V2 Rechargeable HeadlampMax output: 1600 lumens
  • Max beam distance: 558ft (170m)
  • Runtime: Up to 300 hours on eco mode
  • Lighting modes: 8 (3 cool white, 4 warm white, SOS)
  • Battery: 18650 Li-ion, USB-C rechargeable
  • Construction: Magnesium alloy
  • SPORT-fit headband with rotary dial and built-in emergency whistle
  • IP68 waterproof and dustproof

Best for: Endurance runners who need maximum runtime and dual light temperatures for varied conditions.

Why the HM65R-T V2 is a recommended headlamp for ultra-marathons: With 300 hours of runtime on its lowest setting, the HM65R-T V2 is built to outlast even the longest races. Its dual cool and warm white light modes give runners the ability to switch to warm light in foggy conditions for better trail penetration: a critical advantage when conditions change mid-race.

Ready to find your race-day headlamp? Browse the full collection of running headlamps to find the right fit for your next ultra.