Think in Systems
A headlamp is only one part of night strategy. You need light on the course, power through the night, and enough comfort that the lamp does not become another problem at 3 AM.
Product examples live in our headlamp guide. This page is about the race plan.
Battery Math
| Race | Night Exposure | Plan |
|---|---|---|
| 24-hour | One full night | Primary lamp plus backup and one full recharge or battery swap |
| 48-hour | Two nights | Two-lamp rotation or reliable charging between nights |
| Backyard | Unknown | Repeatable loop reset with lamp charging during daylight |
| 6-day | Multiple nights | Redundant lights, labeled chargers, and daily battery checks |
Testing
Test your lamp on the setting you will actually use, not the brightest setting from the product page.
- Run at night for at least 90 minutes with the lamp.
- Wear the same hat, buff, or glasses you expect to use.
- Check bounce, forehead pressure, and whether buttons work with gloves.
- Test charging cables and battery swaps when tired.
- Practice reducing brightness on easy road or track loops to save power.
Backup Plan
A backup light should be reachable while you are away from the crew table. In trail races, that may mean carrying a tiny spare. In looped timed races, it may mean a backup on the table and a handheld light in a pocket during the darkest hours.
Add lights, cables, and batteries to the gear checklist generator before race week.
Sources
- OutdoorGearLab — Headlamp testing methodology and review archive
- International Association of Ultrarunners — Timed ultramarathon event context
- Multiday Running gear review methodology, last reviewed June 2026.
Frequently Asked Questions
How many headlamps do you need for a 24-hour race?
Bring one primary headlamp and one backup light at minimum. Longer events should also include spare batteries or a charging plan.
How many lumens do you need for an ultra?
Looped road or track events may need less light than technical trails. Many runners are comfortable around 200 to 500 usable lumens, but beam quality, comfort, battery life, and backup matter more than peak lumens.
Should you use reactive lighting?
Reactive lighting can save battery and reduce fiddling, but test it first. Some runners prefer predictable manual settings in fog, rain, groups, or reflective environments.