Fenix HM55R Headlamp Reference ManualUpdated 2 hours ago

The Fenix HM55R is a lightweight multi-LED headlamp. This summary is drawn from the manufacturer's official user manual — see the downloadable PDF reference manual on the product page for complete details.

Technical Parameters (ANSI/PLATO FL1)

Spotlight Turbo: 1200 lumens, 2h 10min*, 175 meters, 7453 cd
Spotlight High: 350 lumens, 6h 30min, 88 meters, 1932 cd
Spotlight Med: 130 lumens, 12h 40min, 54 meters, 724 cd
Spotlight Low: 30 lumens, 47h 18min, 27 meters, 175 cd
Floodlight High: 350 lumens, 3h 40min, 62 meters, 948 cd
Floodlight Med: 70 lumens, 17h 40min, 24 meters, 145 cd
Floodlight Low: 5 lumens, 141h 10min, 6 meters, 10 cd
Red Constant-on: 5 lumens, 43 hours, 4 meters, 5 cd
Red Flash: 5 lumens, 86 hours

Impact Resistance: 2 meters. Submersible: IP68. *The Turbo output is measured in total of runtime including output at reduced levels due to temperature or protection mechanism in the design.

Warning

Do NOT place this headlamp in the reach of children!
Do NOT shine the headlamp directly into the eyes of anyone!
Do NOT place light head near flammable objects, high temperatures can cause objects to overheat and become flammable/ignite!
Do NOT use the headlamp in inappropriate ways such as holding the unit in your mouth, doing so could cause serious personal injury or death if the headlamp or internal battery fails!
This headlamp will accumulate a significant amount of heat while operating, resulting in a high temperature of the lamp shell. Pay close attention to avoid burns!
Remove the battery or unscrew the battery cover to prevent accidental activation when the headlamp is placed in a closed and flammable environment such as pockets and backpacks!
The LEDs of this headlamp are not replaceable; so the whole lamp will need to be replaced if any one of the LEDs reaches the end of its lifespan.

Product Features

1200 lumens maximum output, 175 meters maximum beam distance.
Uses one Luminus SST25 LED, one Luminus SST20V-Ra90 LED, one 2835 red LED, with a lifespan of 50,000 hours each.
Spotlight, floodlight and red light sources assist various lighting needs in various complex outdoor scenarios.
Powered by a user-replaceable ARB-L18-1600 rechargeable battery.
Large side switch for simple and convenient operation.
Intelligent brightness downshift function avoids danger caused by high temperature.
Inner waterproof USB Type-C charging port.
IP68-rated protection and 2 meters impact resistance.
Size: 2.52" x 1.34" x 1.73" / 64 x 34 x 44 mm.
Weight: 3.70 oz / 105 g (including battery and headband).

Operating Instructions

On/Off: with the lamp turned off, press and hold the switch for 0.5 seconds to turn on the white light, or double click the switch to turn on the red light. In any mode, press and hold the switch for 0.5 seconds to turn off the lamp.

Mode switching: in Spotlight mode, press and hold the switch for 1.2 seconds to switch to the previously used output of Floodlight mode, and vice versa.

Output selection — Spotlight: single click the switch to cycle through Low→Med→High→Turbo.

Output selection — Floodlight: single click the switch to cycle through Low→Med→High.

Output selection — Red light: single click the switch to select between Red constant-on and Red flash.

Intelligent Memory Circuit

The headlamp automatically memorizes the previously used output level and mode excluding Red light. When turned on again, the previously used output level and mode will be recalled. When turned on in Spotlight mode, the headlamp will activate in High output if it was previously switched off in Turbo output.

Intelligent Brightness Downshift Function

On/Off: with the lamp turned off, press and hold the switch for 6 seconds; the headlamp will blink twice on Low output of Floodlight mode to enable the function, or 8 times to disable it. When the light head is close to an illuminated object (about 2.36"/60mm) for more than 1.5 seconds in Spotlight or Floodlight mode, the headlamp automatically reduces brightness to 30 lumens; when moved away for more than 0.8 seconds, it recalls the previously used level.

Battery Specifications

ARB-L18-1600 (18350, 3.6V): Recommended
ARB-L18-1100 / ARB-L18-1100P (18350, 3.6V): Usable
Other Rechargeable Battery, Li-ion (18350 or 16340, 3.6V): Usable
Non-rechargeable Battery (CR123A, 3.0V): Caution

18350 Li-ion batteries are powerful cells designed for commercial applications and must be treated with caution and handled with care. Using low-quality batteries or mishandling batteries could lead to combustion and jeopardize safety and property; adverse effects are not covered by Fenix warranty. CR123A batteries should be reserved for emergency use only — do not recharge while using a CR123A battery. For optimal performance, use a Fenix ARB-L18-1600 battery.

Battery Replacement

Unscrew the battery cover counterclockwise and insert the battery in accordance with the polarity marks, then screw the battery cover back on.

Charging

Uncover the anti-dust cap and plug the USB Type-C end of the charging cable into the charging port of the lamp.
The indicator will display red while charging and will turn green when fully charged.
Once charging is completed, unplug the charging cable and close the anti-dust cover.
With the lamp turned off, the normal charging time of the included Fenix ARB-L18-1600 battery is about 2.5 hours with a 5V/1A or above charging adapter.

The headlamp can be operated while charging. When the battery level is lower than 3.3V, only the Low output of each mode and the Red flash output can be activated. Recharge a stored headlamp every four months.

Battery Level Indication

With the lamp turned off, single click the switch to check the battery level; the indicator will last for 3 seconds. Each time the lamp is turned on, the indicator also shows the current battery level for 3 seconds.

Green light on: 100% - 80%
Green light flashes: 80% - 50%
Red light on: 50% - 20%
Red light flashes: 20% - 1%

Intelligent Overheat Protection

The headlamp will accumulate a lot of heat when used at high output levels for extended periods. When the headlamp reaches a temperature of 55°C/131°F or above, it will automatically step down a few lumens to reduce the temperature. When the temperature drops below 55°C/131°F, the lamp will gradually recall the preset output level.

Low-Voltage Warning

When the voltage level drops below the preset level, the headlamp is programmed to downshift to a lower brightness level until the lowest output is reached. When this happens at the lowest output, the battery level indicator blinks red to remind users to recharge or replace the battery.

Headband Assembly

The headband is factory assembled and ready to use right out of the package. Adjust the headband by sliding the buckle to the required length.

Usage and Maintenance

Disassembling the sealed head can cause damage to the lamp and will void the warranty.
Fenix recommends using an excellent quality battery.
If the lamp will not be used for an extended period, remove the battery, or the lamp could be damaged by electrolyte leakage.
Take out the battery to prevent accidental activation during storage or transportation.
Long-term use can result in O-ring wear. To maintain a proper water seal, replace the O-ring with an approved spare.
Periodic cleaning of the battery contacts improves the lamp's performance: A) Poor battery level — recharge or replace. B) Dirty contacts — clean with a cotton swab soaked in rubbing alcohol. If the above methods don't work, contact the distributor.

What's Included

Fenix HM55R headlamp, ARB-L18-1600 battery, Spare O-ring, USB Type-C charging cable, User manual, Warranty card.

Was this article helpful?

Yes