Fenix HM75R Pro Headlamp Reference ManualUpdated 2 hours ago

The Fenix HM75R Pro is a high-output rechargeable 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: 3300 lumens, 3h33m*, 398 meters, 39852 cd
Spotlight High: 800 lumens, 6h28m, 189 meters, 8968 cd
Spotlight Med: 350 lumens, 16 hours, 124 meters, 3861 cd
Spotlight Low: 50 lumens, 68 hours, 47 meters, 549 cd
Floodlight Turbo: 1500 lumens, 3h39m, 85 meters, 1805 cd
Floodlight High: 400 lumens, 11h21m, 42 meters, 448 cd
Floodlight Med: 50 lumens, 102h45m, 15 meters, 56 cd
Floodlight Low: 5 lumens, 516 hours, 4 meters, 4 cd
Spot+Flood Turbo: 3500 lumens, 3h22m, 334 meters, 27884 cd
Spot+Flood High: 1200 lumens, 4h45m, 148 meters, 5453 cd
Spot+Flood Med: 400 lumens, 14h50m, 81 meters, 1647 cd
Spot+Flood Low: 50 lumens, 56h45m, 29 meters, 207 cd
Red High: 140 lumens, 8h25m, 30 meters, 226 cd
Red Med: 30 lumens, 74h15m, 14 meters, 47 cd
Red Low: 5 lumens, 366 hours, 6 meters, 8 cd
Red Flash: 5 lumens

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 within the reach of children!
Do NOT shine this headlamp directly into the eyes of anyone!
Do NOT place the 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!
Turn off the headlamp or remove the battery 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

3500 lumens maximum output, 398 meters maximum beam distance.
Uses one Luminus SFT90X white LED, two Luminus SST25 white LEDs, and one OSRAM GR QSSPA1.23 red LED, with a lifespan of 50,000 hours each.
Spotlight, floodlight, combined output, and red light meet various lighting needs in complex outdoor scenarios.
Rotary switch and electronic switch combination for quick output selection and mode switching.
Magnesium alloy lamp body, lightweight and durable.
Powered by an included ARB-L21-5500 replaceable battery.
Inner waterproof USB Type-C charging port.
Intelligent sensing function avoids danger caused by high temperature.
IP68-rated protection and 2 meters impact resistance.
Size (including mount): 3.85" x 1.98" x 2.44" / 97.8 x 50.4 x 61.9 mm.
Weight: 7.55 oz / 214 g (including battery and headband).

Operating Instructions

On: with the lamp turned off and locked, rotate the rotary switch from Off to any mode to turn on the headlamp. With the lamp unlocked, press and hold the electronic switch for 0.5 seconds to turn on the headlamp.

Off: with the lamp turned on, rotate the rotary switch to Off to turn off and lock the headlamp, or press and hold the electronic switch for 0.5 seconds to turn off the headlamp.

Mode switching: rotate the rotary switch to cycle bidirectionally through Red light mode ⇄ Lockout mode ⇄ Spotlight mode ⇄ Floodlight mode ⇄ Spot-and-floodlight mode. By default, the rotary switch is set to Off/Lockout mode.

Output selection: in Spotlight, Floodlight, or Spot-and-floodlight mode, with the lamp turned on, single click the electronic switch to cycle through Low→Med→High→Turbo. In Red light mode, single click the electronic switch to cycle through Low→Med→High→Flash.

Turbo mode: in any white light mode, press and hold the electronic switch for 1.2 seconds to enter Turbo mode. In Turbo mode, single click the electronic switch, or remain inactive for 60 seconds, to recall the previously used mode and output. The actual brightness performance in Turbo mode may vary depending on factors such as battery level and working environment. Built-in intelligent overheat protection automatically reduces brightness when the temperature exceeds 55°C.

Intelligent Sensing Function

On: with the lamp turned off, press and hold the electronic switch for 6 seconds; the headlamp will blink twice in Low output of Floodlight mode to indicate the function is enabled.

Off: repeat to disable (8 blinks). When the light head is close to an illuminated object (about 2.36"/60mm) in a white light mode, the headlamp automatically downshifts to Low output; when moved away for over 0.8 seconds, it gradually recalls the previously used brightness level.

Intelligent Memory Circuit

The headlamp automatically memorizes the last selected output of each mode excluding Red light. When turned on again, the last selected output will be recalled. The headlamp will activate in High output if it was previously switched off in Turbo output.

Battery Specifications

Fenix ARB-L21 Series (21700, 3.6V): Recommended
Other Rechargeable Battery, Li-ion (21700, 3.6V): Caution
Battery without Protection Board, Li-ion (21700, 3.6V): Banned

21700 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 (such as short-circuiting or overheating) could lead to combustion and jeopardize the safety of users and property; adverse effects are not covered by any Fenix warranty. Using quality batteries with circuit protection will reduce the potential for combustion or explosion. Do not use batteries prohibited in this manual or batteries without a protection board.

Battery Replacement

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

Charging

Open the anti-dust cover and plug the USB Type-C end of the charging cable into the charging port of the headlamp.
When charging, the indicators light up in sequence to display charging status. The four indicators will be constant-on after charging is completed.
Once charging is completed, be sure to unplug the charging cable and close the anti-dust cover to prevent the ingress of dust and debris.
With the lamp turned off, the charging time of the included Fenix ARB-L21-5000 V2.0 battery is approximately 1.5 hours from depleted to fully charged with a 5V/2.5A or above charging adapter.
The headlamp can be operated while charging, with all outputs available except Turbo.
Recharge a stored headlamp every four months to maintain optimum battery performance.
Only use a certified USB charging adapter that complies with local safety standards.

Battery Level Indication

With the lamp turned off, single click the electronic switch to check the battery status. Single click again and the indicator(s) will go out immediately; otherwise the indicator(s) will last for 3 seconds. Each time the lamp is turned on, the indicator(s) will show the battery level for 3 seconds.

Four lights on: 100% - 80%
Three lights on: 80% - 60%
Two lights on: 60% - 40%
One light on: 40% - 20%
One light flashes: 20% - 1%

This only works with a Fenix ARB-L21 Series battery.

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 decrease the brightness 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 Low output is reached. When this happens in Low output, one of the battery level indicators blinks 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 headlamp and will void the warranty.
Fenix recommends using an excellent quality battery.
If the headlamp will not be used for an extended period, remove the battery, or the lamp could be damaged by electrolyte leakage.
Remove 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) Low 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 HM75R Pro headlamp, ARB-L21-5500 battery, USB Type-C charging cable, Spare O-ring, User manual, Warranty card.

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