Fenix HM23 V2.0 Lightweight Detachable AA Headlamp

Performance Highlights

• Output: Up to 300 lumens on High, throwing to 289 ft.
• Runtime: Up to 100 hours on Low.
• Versatile: Quick-release headband bracket doubles the headlamp as a handheld flashlight.
• Rugged: IP68 waterproof and 2-meter impact resistant, rated to -35°C.

Full mode-by-mode output, runtime, distance, and intensity figures are shown in the specifications chart above.

Key Features

• Luminus SST20 white LED plus two 2835 red LEDs, each rated 50,000 hours
• Single large side switch handles power, mode switching, and lockout
• Magnetic tail cap and integrated body clip for hands-free or handheld use
• Intelligent memory circuit recalls the last-used output per mode
• Reverse polarity protection

Battery & Charging

• Powered by: One AA battery (not rechargeable onboard — this model has no charging function)
• Included: One alkaline AA battery
• Compatible: Fenix ARB-L14-U series (14500) or Ni-MH AA batteries under 2V
• Not supported: 14500 Li-ion batteries above 2V

Size & Weight

• Dimensions: 2.90" x 1.42" x 1.18"
• Weight: 3.04 oz (including battery and headband)

Q: What kind of LEDs are used in HM23 V2.0? Does Fenix offer to replace LED?

A: Fitted with one Luminus SST20 white light LED and two 2835 red light LEDs; with a lifespan of 50,000 hours each. 

Q: What is the color temperature of HM23 V2

A: The color temperature is 5700-6500K.

Q: What is the operating voltage of HM23 V2.0?

A: The operating voltage is 1.5V.

Q: Is HM23 V2 rechargeable? How long is the charging time? 

A: The HM23 V2 is not directly rechargeable but can use rechargeable batteries such as the Fenix ARB-L14-2200U battery or Ni-MH AA batteries below 2V. Batteries must be charged outside of the headlamp.

Q: How does the HM23 V2 lockout function work?

Lock: with the lamp switched off, press and hold the switch for 3 seconds, the lamp will blink red 4 times to indicate locked status. 

Unlock: with the lamp locked, press and hold the switch for 3 seconds, the lamp will be activated on the Low output of White light mode after blinking red 4 times to indicate the unlocked status. 

In the locked status, a single click or double click of the switch will activate 4 red blinks to indicate the locked status.

*Note: With the light locked, even if you remove and re-insert the battery, the light will not be unlocked automatically. 

Q: Why does the HM23 V2 downshift to a lower mode after being used for a while and the higher mode cannot be selected?

A: 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 in the lowest output, the lamp blinks 3 times every 5 minutes to remind users to replace the battery. 

Q: Why does the HM23 V2 flicker?

A: The reasons that may cause the lamp to flicker, shine intermittently or even fail to illuminate:

A: Poor battery level.

Solution: Replace the battery.

B: The contact point or contact of the battery or headlamp is dirty. 

Solution: Clean the contact points with a cotton swab soaked in rubbing alcohol.

If the above methods don't work, please contact Fenix Store support through live chat (the chat button on any page of fenix-store.com) or at support@fenix-store.com.

Q: What kind of battery can be used in HM23 V2?

A: It is recommended to use a 1.5V alkaline battery. The headlamp is also compatible with either a Fenix ARB-L14-U series rechargeable battery or a Ni-MH battery with a voltage of 2.0V or lower. Using a battery with a voltage exceeding 2V will cause damage to the headlamp.

The Fenix HM23 V2.0 is a lightweight detachable AA 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)

• White High: 300 lumens, 5h 22min* (AA) / 9 hours* (ARB-L14-2200U), 88 meters, 1930 cd
• White Med: 50 lumens, 11h 30min (AA) / 14 hours (ARB-L14-2200U), 34 meters, 284 cd
• White Low: 3 lumens, 100 hours (AA) / 90 hours (ARB-L14-2200U), 8 meters, 16 cd
• Red Constant-on: 5 lumens, 17 hours (AA) / 18 hours (ARB-L14-2200U), 5 meters, 5 cd
• Red Flash: 5 lumens, 34 hours (AA) / 36 hours (ARB-L14-2200U)

Impact Resistance: 2 meters. Submersible: IP68. *The High 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 headlamp shell. Pay close attention to avoid burns.
• Turn off and lock the headlamp or take out the battery to prevent accidental activation during storage or transportation.
• The LEDs of this headlamp are not replaceable; so the whole headlamp will need to be replaced when any of the LEDs reaches the end of its lifespan.

Product Features

• 300 lumens maximum output, 88 meters maximum beam distance.
• Utilizes one Luminus SST20 white LED and two 2835 red LEDs, with a lifespan of 50,000 hours each.
• Powered by one AA battery and compatible with one 1.5V 14500 rechargeable battery.
• White and red light sources assist various lighting needs in different outdoor scenarios.
• Electronic lockout avoids accidental activation.
• Large side switch for fast and simple operation.
• Can be used as a headlamp and flashlight.
• Magnetic tail for hands-free use.
• Reverse polarity protection to protect from improper battery insertion.
• Lamp body is made of aluminum alloy material, lightweight and durable.
• IP68-rated protection and 2 meters impact resistance.
• Headlamp (including mount): 2.90" x 1.42" x 1.18" / 73.6 x 36 x 30 mm.
• Weight: 3.04 oz / 86.3 g (including battery and headband).

Operating Instructions

On/off: press and hold the switch for 0.5 seconds to turn on/off the lamp.

Mode switching: with the lamp switched off, press and hold the switch for 0.5 seconds to enter White light mode. Double click the switch within 0.5 seconds to enter Red light mode.

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

Output selection — Red light mode: single click the switch to cycle through Constant-on→Flash.

Lockout Function

Lock: with the lamp switched off, press and hold the switch for 3 seconds; the lamp will blink red 4 times at 2Hz to indicate locked status.

Unlock: with the lamp locked, press and hold the switch for 3 seconds; the lamp will be activated on the Low output of White light mode after blinking red 4 times. Removing and re-inserting the battery does not unlock the light — you must still press and hold the switch for 3 seconds.

Intelligent Memory Circuit

The headlamp automatically memorizes the last selected output of each mode. When turned on again the previously used output of the selected mode will be recalled.

Battery Specifications

• Alkaline Battery (AA, 1.5V): Recommended
• Ni-MH Battery (AA, 1.2V): Usable
• Fenix ARB-L14-U Series (14500, 1.5V): Usable
• Rechargeable Battery (Li-ion, 14500, 3.6V): Banned

It is recommended to use a 1.5V alkaline battery. The headlamp is compatible with either a Fenix ARB-L14-U series rechargeable battery or a Ni-MH battery with a voltage of 2.0V or lower. Using a battery with a voltage exceeding 2V will cause damage to the headlamp.

Battery Replacement

Unscrew the battery cap and insert the battery with the anode side (+) towards the inner side, then screw the battery cap back on.

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 lamp blinks 3 times every 5 minutes to remind users to replace the battery.

Headband Assembly

The headband is factory assembled by default. 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.
• Lock the lamp or take out the battery to prevent accidental activation during storage or transportation.
• Periodic cleaning of the battery contacts improves the lamp's performance, as dirty contacts may cause the lamp to flicker, shine intermittently, or even fail to illuminate: A) The lamp is locked — press and hold the switch for 3 seconds to unlock. B) Poor battery level — replace the battery. C) Dirty contacts — clean with a cotton swab soaked in rubbing alcohol. If the above methods don't work, please contact Fenix Store support through live chat (the chat button on any page of fenix-store.com) or at support@fenix-store.com.

What's Included

Fenix HM23 V2.0 headlamp, AA battery, Spare O-ring, User manual, Warranty card.