Fenix HM50R USB Rechargeable Headlamp

Max Lumens: 500
Modes: 4
Battery: 16340 or CR123A
(125 customer reviews)


Never let the elements keep you from pursuing your passions. We would like to introduce the HM50R rechargeable headlamp with its lightweight and indestructible body. Don’t let its small size fool you; this headlamp is power packed throwing a 500 lumen beam to a max range of over 250 feet. Its surprisingly long run time at lower settings and fantastic value makes it the perfect partner to take camping, hiking or running when your goal is to extend your day.

The HM50R is one of our top picks for an everyday rechargeable headlamp with its solid construction and lightweight size. One 16340 rechargeable Li-ion battery is included or you can use one CR123A lithium battery to power it. This rechargeable headlamp also comes with a spare O-ring, spare rubber anti-dust cover, spare silicone holder, charging cable. Watch the HM50R quickly become your go-to headlamp!

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: 500
Modes: 4


fenix hm50r headlamp specification chart

HM50R Headlamp Size (including the lamp holder):

Length: 2.7″ (67.5mm)
Width: 1.3″ (33mm)
Height: 1.1″ (28mm)

HM50R Headlamp Weight:

2.2 oz. (63g) excluding battery

HM50R Batteries:

One 16340 rechargeable Li-ion battery (Included) or one CR123A lithium battery

Included with the HM50R:

ARB-L16-700 Li-ion battery, spare O-ring, spare rubber anti-dust cover, spare silicone holder, charging cable

Turbo output is measured in total runtime including output at reduced levels due to temperature or protection mechanism in the design of the light.


Limited Lifetime Guarantee from Fenix Lighting U.S.

Additional Features of the Fenix HM50R

  • The HM50R uses Cree XM-L2 U2 white LED with lifespan of 50,000 hours
  • The HM50R is powered by one rechargeable 16340 Li-ion battery or one CR123A Lithium battery
  • Micro USB rechargeable headlamp (16340s only)
  • Premium type III hard-anodized anti-abrasive finish
  • Material is quality aluminum
  • Easy operation with only 1 switch
  • Can be used as a mini flashlight
  • Reverse polarity protection to guard against improper battery insertion
  • Sweat-channeling, reflective headband
  • Capable of withstanding temperatures down to -40º (CR123’s ONLY)
  • Toughened ultra-clear glass lens with anti-reflective coating
  • IP68 rating – underwater up to 6.6 feet/2 meters and dust proof


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

Output selection for the HM50R:

With the headlamp switched on, single click the switch to cycle through Low→Med→High→Turbo.

Note: The headlamp memorizes the last selected brightness. When turned on again the previously used brightness level will be recalled.

Battery level indication

With the headlamp switched off, single click the switch to display the battery level for 3 seconds in different colors:

  • Green constant on: more than 80%
  • Green flashes: 50% – 80%
  • Blue constant on: 20% – 50%
  • Blue flashes: less than 20%

Charging the HM50R Rechargeable Headlamp

Uncover the anti-dust cap and plug the Micro USB terminal of the charging cable into the charging port of the headlamp. Once you’re done recharging this headlamp, be sure to remove the charging cable and replace the anti-dust cap. The max charging current is 700mA, and the charging time is about 1.5 hours. The indicator displays blue when charging, and turns green when fully charged. The headlamp can only be used on Med output when charging.

Warning: Avoid charging non-rechargeable batteries.

Intelligent Overheat Protection

The light will accumulate a lot of heat when used on Turbo output level for extended periods. When the light reaches a temperature of 65°C or above, the light will automatically downshift to High output to reduce temperature. Reset to Turbo if needed.

Low Voltage Downshift

When the voltage of the 16340 battery in use drops lower than 3.0V, the low voltage downshift function will be activated. In this state the headlamp cannot be used on Turbo output and will only cycle through High, Med and Low.

Extended Runtime

The headlamp will automatically step down by a few lumens after being used for an extended period on any of the outputs to extend runtime and to guarantee illumination outdoors.

Use the HM50R as a Flashlight

Remove the tail cap and the battery, then remove the headlamp from the holder. Re-insert the battery and screw back the tail cap.

Battery Replacement

Unscrew the tail cap to insert the battery with the anode side (+) towards the lamp head, then screw the tail cap back on.

Headlamp Holder Replacement

The headlamp holder is made of enhanced silicone, which gives it good anti-tearing ability and mechanical strength, and makes it resistant to low and high temperature, ultraviolet rays, acid and alkali corrosion. The material feels smooth to the touch and should not cause allergic reactions.

If the headlamp holder needs replacing, open the tail cap, remove the battery and the holder, and replace with the new spare holder.

Headband Assembly

Notice: The headband is factory assembled by default.

Usage and Maintenance of the HM50R

  • Disassembling the sealed head can cause damage to the lamp and will void the warranty.
  • Fenix recommends the use of only excellent quality batteries in the HM50R.
  • If the lamp will not be used for an extended period, remove the battery, or the lamp could be damaged by electrolyte leakage or battery explosion.
  • Unscrew the tail cap half a turn 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 HM50R headlamp is a high-intensity lighting device capable of causing eye damage to the user or others. Avoid shining the headlamp directly into anyone’s eyes.

125 reviews for Fenix HM50R USB Rechargeable Headlamp

Based on 125 reviews
  1. J C. (verified owner)

    Nice and light weight comfortable to wear for multiple hours at work. Battery life is good on lower settings

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  2. Joel A. (verified owner)


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  3. Lisa L. (verified owner)

    Small, lightweight and great for backpacking.

    1 out of 1 people found this helpful. Was this review helpful to you?
  4. Jeffrey H. (verified owner)

    I love all of the features of this headlamp with one exception, no red light. That would have been a disqualifier, but I am pretty handy and figured I could make my own red filter with some acrylic. The light itself works really well and the brightness settings and battery duration are great, I was able to make a red acrylic filter that is held over the lens with a braided elastic strap, it isn’t perfect, but it’s been working so far for camping and stargazing when I don’t want to ruin my night vision. If Fenix can get a light this size, with the same easily rechargeable/swappable battery, and with a red light filter I would give them six stars!

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

    I am a degreed mechanical engineer with twenty years of industry experience. I am very picky about the “stuff” that I buy. I hate low quality junk whether it is tools, electronics, cars, or items for my house. I have owned several different headlamps and all of them have disappointed me in some way. This Fenix HM50R is an AMAZING piece of engineering. Super well thought out. I can’t think of anything I would change on it (which is rare for me to say about a product). The engineering and manufacturing team that designed and builds these should be very proud of this one. Don’t change a thing about it and don’t think about discontinuing this model for a “new and improved” model.

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