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Fenix HM23 Headlamp

Max Lumens: 240
Modes: 3
(7 customer reviews)

$46.00 $34.95

SKU: HM23NLBK Categories: , ,

The HM23 is a multi-purpose AA battery powered headlamp that can shine a maximum 240 lumens a distance of 174 feet. Made from high-strength aluminum and silicone, this tough little headlamp weighs only 1.5 ounces and is waterproof and dustproof. Convenient side switch quickly controls three brightness levels of soft neutral white light. And the extremely comfortable, stay put, reflective headband plus 180 degree adjustable beam make this headlamp perfect for all kinds of activities—running, hiking, camping and climbing.

For commercial orders and large purchases, contact us at (888) 775-9996 x6, or
WARNING. Be aware of counterfeit Fenix merchandise in the U.S. marketplace.

Max Lumens: 240
Modes: 3


hm23 headlamp spec chart

Length: 2.7” (69.5mm)
Width: 1.3” (32mm)
Height: 1.6” (40mm)

Weight: 1.5 oz. (43g) excluding battery

Battery: One included Alkaline AA Battery

Included: Alkaline AA battery, hollow headband, silicone holder, spare O-ring

Warranty: Limited Lifetime Guarantee from Fenix Lighting USA

  • Cree neutral white LED with a lifespan of 50,000 hours.
  • Powered by one AA (alkaline/ Ni-MH) battery (included).
  • Max 240 lumens and max 100 hours runtime.
  • Three output levels for all kinds of lighting demands.
  • Digitally regulated output maintains sectional constant brightness.
  • Reverse polarity protection to protect improper battery insertion.
  • One-switch control ensures easy and fast operation.
  • Low-voltage warning reminds when battery replacement needed.
  • Made of quality aluminum and silicone – tough and durable.

Press and hold the switch for 0.5 seconds to turn on/off the light.

Output Selection
With the lamp switched on, single click the switch to cycle through Low→Med→High.
Note: Low mode is activated by default when the lamp is turned on.

Battery Replacement
Unscrew the battery cap to insert the battery in accordance with the polarity marks, then screw the battery cap back on.

Low Voltage Warning
With the lamp switched on, if the voltage level drops below the preset level, the lamp is programmed to downshift to a lower brightness level until low output is reached. When this happens in low output, the lamp blinks to remind you to replace the battery. To ensure normal use, the lamp will not turn off automatically and will work until the battery level runs out.

Headband Assembly
Notice: The headband is factory assembled by default.
Step 1: Attach the headband to the headlamp as shown (Pic Ⅰ-Ⅷ).
Step 2: Adjust the headband by sliding the buckle to required length.

Usage and Maintenance

  • Disassembling the sealed head can cause damage to the lamp and will void the warranty.
  • Loosen the battery cover or 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 ring with an approved spare.
  • 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 for the following reasons:
    A: The battery needs replacing.
    Solution: Replace battery (Ensure battery is inserted according to the manufacturer’s specifications).
    B: The threads, PCB board contact or other contacts are dirty.
    Solution: Clean the contact points with a cotton swab soaked in rubbing alcohol.

If the above methods don’t work, please contact your authorized distributor.

The headlamp is a high-intensity lighting device capable of causing eye damage to the user or others. Avoid shining the lamp directly into anyone’s eyes.

7 reviews for Fenix HM23 Headlamp

  1. Tsov Tom

    The HM23 is a step backwards compared to the HL23. Now even though the claim is a total of 8 hrs on high output including drop offs, My HM23 got about 2.5 hrs of conservative operation time between medium and high setting before I was no longer able to switch out of low without a new battery (Eneloop Pro).

    I knew going into this that the stated claims would be nowhere near the advertised 8hr at 240L. (I have yet to find a light from any manufacturer that lives up to their advertised claims in real world usage) I did however expect the headlamp stay at 240L for at least 1hr. To my disbelief, the HM23 would not even operate at 240L for a straight hour without dropping down to a lower lumen output mode. The headlamp should be advertised with true runtimes instead of the fine print drop off runtime times. Now, the HM23 does have a few features over its predecessor, HL23, a nicer headband, neutral white light and the rubberized housing bracket. As far as light output goes, from my perspective, there’s not that much of a difference between the claimed 240L of the HM23 vs the HL23’s 150L. Yeah, the HM23 does produce a little more light, but what the HL23 lacks in extra lumens, it makes up in lumen stamina usability.

    Given the choice between the HL23 or the HM23, I would choose the HL23. Heck, I would even choose brand “X” (the HL23 rival) that gives off that horrible green tint over the HM23. There’s nothing worse than having a headlamp go dim on you while trekking through the woods and dodging branches left and right. At least with the HL23, I know that I will get a dependable 45-50 minutes of 150L output before before dropping into low mode.

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  2. Anonymous (verified owner)

    Great – one battery, small but powerful. Simple to use – no magic secret Morse code clicks to bother about to turn it on (unlike my Black Diamond lights – gotta use the instructions just to get some light with them). My second favorite light, right behind my HL60R !

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  3. Jay R

    Headlamp was purchased because of good advertised output/run-time on a single AA battery. Fenix fails to state that this light will only run on high output for approx. 10 minutes and medium output for approx 20 mins. before automatically switching over to low power. Once on low power, it cannot be changed (“until light cools off”). This light will not be useful to you unless you plan on running it on low power all the time. I would not recommend to others.

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  4. X

    Just look at the runtime chart. It’s obvious this light won’t stay in full brightness in High or even Medium mode for more than a few minutes. You can’t get the claimed brightness for the claimed runtime out of this light.

    That’s super dishonest, Fenix. Shame on you.

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    • Dianne (store manager)

      The chart on the website specifically states that the high output is measured in total of run time including output at reduced levels due to temperature or protection mechanism in the design. We also include a chart in pictures of the products that shows how the drop off occurs, so we are not sure how this is dishonest of us when we show this on our product page.

  5. Thomas (verified owner)

    Outstanding power for the size and weight. Very useful design all the way around.

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  6. Todd Plager (verified owner)

    Excellent build quality, lightweight, and great illumination levels.

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  7. Tom Page (verified owner)

    light comfortable and works

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