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Fenix HM23 Headlamp

$46.00 $34.95

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Max Lumens:


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SKU: HM23NLBKN/ABarcode: 6942870306834N/A

Product Overview

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.


Max Lumens: 240
Max Beam Distance: 207 feet (63 meters)
Max Runtime: 100 hours
Lighting Modes: 3 brightness levels
Bulb Type: Cree neutral white LED
Size: 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

More Information

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.
Fenix HM23 Headlamp specs chart


Fenix HM23 Headlamp runtime chart


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 Specifications



Nominal Voltage



Ni-MH Battery





Alkaline Battery




Non-rechargeable Battery (Lithium)




Rechargeable Battery (Li-ion)





*Disposable lithium battery: it can be used if the voltage is below 1.5V; or it may cause damage to the lamp if the voltage exceeds 1.5V.


  1. Do not use the banned battery in case of circuit component damage that is resulted from overvoltage burnout.
  2. If the lamp will not be used for an extended period, remove the battery from the lamp in case of damage by electrolyte leakage.

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.

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    No compatible accessories available

Customer Reviews

Based on 64 reviews
Really wanted to like this

I really wanted to like this headlamp. Everything about it seems right, but on medium it lasts about an hour and then dims down to low. Which can be really inconvenient when you're in the middle of unfamiliar woods on a hike.
Physically the headlamp wins a star because of it's adjustability and size.


super lightweight nice band

George T.
I like everything except for the battery consumption

This is a great head lamp. Lightweight, uses common AA, nice light spread, nice light color. BUT, when used in Medium, it only lasts ONE hour. Then it drops to Low, You can even see this in the graph. But the Table lists 16 hours in Medium. That's 1 hour in Medium and 15 hours in Low, which is really dim to be useful. I wish the medium had something like 50 Lumens and lasted a couple of hours. As it is, this is not useful for me running at night.

Basic. Functional. Lightweight. Intuitive.

Have numerous Fenix lights. Fan of them all. Got this for mornings getting ready for work. Great for 15-20ft. Easy to handle. Intuitive functioning between modes. AA batteries are plentiful. Only thing I'd add is a long press "Off" to lock the headlamp for backpack storage.

Justin Middleton
Great light for trail running.

I had a heavier light from this company that works great, just got this one too, to have a lighter option to take on short runs. Works great!


The headband is comfortable and reflective. High quality design

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