Fenix HM23 Headlamp

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

$46.00 $34.95

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.

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Max Lumens: 240
Modes: 3


hm23 headlamp spec chart


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


1.5 oz. (43g) excluding battery


One included Alkaline AA Battery


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


Limited Lifetime Guarantee from Fenix Lighting USA

Additional Features of the Fenix HM23

  • 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.

11 reviews for Fenix HM23 Headlamp

  1. Glen Carter (verified owner)

    I have five Fenix products. Two bike lights, a flashlight, and another headlamp (HL60R – a great light). Love all of them…except this one. I took it a an emergency light on a bikepacking trip and had to use it to descend 3500′ down a dirt road at night. For the first few minutes it did OK, but not great, at throwing a beam. After a mile or so of the 14 mile descent, it dimmed to the point that I had to constantly brake, doing no more than ten miles an hour. I now keep it on one of my bikes as a simple light to effect repairs, or to walk, no more. Fenix, naughty – you owe a redesign to this light!

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    • Dianne (store manager)

      Hi Glen – we would agree that this is not the best headlamp in the line up for mountain biking and we have lots of other options that would be better. The HM23 is a AA light that hits 240 lumens on high, and medium of 70. With the size and AA battery it does have a faster decline in lumens than a lot of out other lights. When looking at the headlamp options, I would take a look at all the pictures on the product page, as most of them should have a runtime chart that will show you how quickly the light will reduce in brightness based on the mode you are in.

  2. Travis Cron (verified owner)

    I do alot of fishing and love the look and durability of the light. But my disappointment is in the battery life. I bought two of these. And the first night of fishing which was 7hrs took 3 aa batterys almost a whole pack. So of you buy one take plenty of batterys

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  3. Pete Donahue (verified owner)

    Fits great on my Wildland Fire helmet. Low profile and very easy to operate. The fact that it only takes one AA battery is a plus as well. Can easily find them anywhere. That was the main draw for the selection. But all these things are appreciated as well.

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  4. Anthony

    Please bring back the HL23 !!! I have received and used my HM23 for a few days/nights now and it is several steps backwards compared to the HL23. It is smaller, lighter and has a nice head band but that is all.
    It will just say it, the HM23 doesn’t even start to compared to the HL23 which I have a few of. It is difficult to adjust the light angle with the rubber holder and it will not run on high but for a few mins before switching to lower setting. I have been a Fenix customer for a few years now owning several different flashlights, when the e21 flashlight was discontinued I was very disappointed, I tried the units that were supposed to replace it, they didn’t and I turned to a different brand for a AA torch. I am very hard on lights and go through several yearly either from my own rough usage or I loose them. Now it seems I will have to find a different brand of headlight as the HM23 is not even close to a comparable replacement for the HL23.

    8 out of 11 people found this helpful. Was this review helpful to you?
  5. 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.

    9 out of 10 people found this helpful. Was this review helpful to you?
  6. 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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  7. 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.

    7 out of 7 people found this helpful. Was this review helpful to you?
  8. 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.

    8 out of 8 people found this helpful. Was this review helpful to you?
    • 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.

  9. Thomas (verified owner)

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

    0 out of 1 people found this helpful. Was this review helpful to you?
  10. Todd Plager (verified owner)

    Excellent build quality, lightweight, and great illumination levels.

    0 out of 1 people found this helpful. Was this review helpful to you?
  11. Tom Page (verified owner)

    light comfortable and works

    0 out of 1 people found this helpful. Was this review helpful to you?
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