The third generation of the very popular rechargeable headlamp Fenix HM51R Ruby V3.0 offers a luminous flux of up to 860 lumens (ANSI) of neutral white light (4500 K) with a beam range of up to 140 meters and is also equipped with red LEDs. It is powered by one RCR123A rechargeable battery (included in the package), which charges directly inside the flashlight via a modern USB-C connector; alternatively, a disposable lithium CR123A battery can be used for power (with a limited max output of 150 lumens). There is also an indicator LED in the control button, so you will always know when to recharge the battery. The tail cap of the flashlight is magnetic, so it can be easily attached to anything made of iron. The HM51R features nine different lighting modes, allowing you to choose between high power and long runtime (up to 125 hours). The flashlight is powered by a digitally controlled constant current to guarantee constant light output even as the voltage in the batteries decreases (during their gradual discharge).

The all-metal construction ensures high durability, optimal cooling, and is also fully waterproof according to the IP68 standard up to a depth of 2 meters underwater. The practicality of the headlamp is enhanced by the ability to remove the light from the head holder and use it as a small pocket flashlight. In addition, the headlamp is equipped with a removable steel clip, so you can easily attach it to a pocket or strap. The Fenix HM51R V3.0 headlamp is the ideal companion for various sports activities, trips to nature, as well as for home and work use.

The Fenix HM51R headlamp is a limited edition based on the Fenix HM50R headlamp and offers a number of improvements. For example, higher output for both white and red light, larger battery capacity, warmer light tint, magnetic tail cap, constant regulation in most modes, more red light modes, and more.

All flashlight parameters (luminous flux, battery runtime, waterproofing, beam range, and impact resistance) are measured in compliance with the ANSI/NEMA FL 1-2009 standard.

Parameters of the Fenix HM51R Ruby V3.0 Headlamp

• A premium powerful SST-20-WS LED of the second generation with a neutral light tint (4500 K) and a lifespan of 50,000 hours, plus two red Everlight LEDs are used.
• Five white light modes: 860 lumens (1.25 hours) -> 450 lumens (2 hours) -> 160 lumens (3.1 hours) -> 50 lumens (10 hours) -> 3 lumens (125 hours)
• Four red light modes: 10 lumens (45 hours) -> 1 lumen (75 hours) -> red flashing 10 lumens (76 hours) -> SOS 5 lumens (116 hours)
• Measured with the included Li-ion battery Fenix RCR123A with a capacity of 950 mAh (included).
• In an emergency, one disposable 3V lithium CR123A battery can be used for power, but the highest available mode will be 150 lumens.
• Digital constant power regulation with overheat protection.
• Charging via USB-C connector on the side of the headlamp; charging time for a fully discharged battery is approx. 2 hours.
• Smooth light beam with a range of up to 140 meters (4,890 cd).
• 66 mm length x 36 mm width x 32 mm height (including the headlamp holder).
• 84 grams (including strap and battery).
• Battery capacity indication and low voltage warning.
• The flashlight has memory and always turns on in the last set mode (applies to both white and red light).
• Magnetic tail cap; the headlamp can be attached to anything made of iron.
• Reverse polarity protection (against incorrect battery insertion).
• The smartly designed holder doubles as a clip if you remove the headlamp from the strap.
• Comfortable perforated strap with reflective elements.
• Simple operation with a single switch.
• Body made of high-strength aerospace aluminum alloy A6061-T6.
• Durable hard-to-scratch surface - Type III hard anodized.
• Dustproof and waterproof according to IP68 standard (tested underwater at a depth of 2 meters for 4 hours).
• Impact-resistant to drops from a height of 2 meters.
• High-quality TIR optics with high light transmission.
• Package includes the HM51R V3.0 headlamp, ARB-L16-950P battery, spare O-ring, USB-C charging cable, steel clip.
• You can purchase the Fenix APB-20 case and a set of black straps AFH-02 without reflective elements - suitable for hunting, army, or police.
• After removing from the holder, the headlamp can be attached to handlebars using Lockblock and Bikeblock mounts.
• Furthermore, it is possible to purchase a spare strap, USB mains adapter, and USB car adapter or a spare RCR123A battery with USB-C connector.

Usage

From the factory, there may be a black insulating cap inside the flashlight on the battery. Remove it from the battery before first use.

• The switched-off headlamp turns on to the last used white light mode by holding the button for 0.5 seconds.
• The switched-off headlamp turns on to the last used red light mode by double-pressing the button quickly.
• The switched-on headlamp turns off by holding the button for 0.5 seconds.

If the headlamp is switched on, short presses of the button can cyclically switch power modes in the order 3 - 50 - 160 - 450 - 860 lumens (when turned on to white light) or red 1 lumen - red 10 lumens - red flashing - red SOS (when turned on to red light). The flashlight has memory and always turns on in the last set mode (applies to both white and red light).

Overheat protection: When using the headlamp on high power modes for a long time, a large amount of heat accumulates. When the headlamp reaches a temperature of 60 °C or higher, it automatically reduces power by a few lumens to lower the temperature. When the temperature drops below 60 °C, the power gradually increases again.

Battery charge status indication: After a short press of the button (the headlamp must be switched off), the LED indicator in the button is activated. If the indicator diode shines green, the battery is charged to more than 85%. Green flashing means 50-85% capacity. If it shines red, it is charged to 20-50%. Red flashing indicates that less than 20% of battery capacity remains. The indication works correctly only with rechargeable RCR123A / 16340 batteries.

Charging: Flip open the rubber cap of the charging connector and plug the included cable into the flashlight (USB-C connector), plug the other end of the cable into a computer, power bank, or USB mains or car adapter (not included). During charging, the side button glows red and turns green when fully charged. After charging the flashlight, seal the charging connector again with the rubber cap. Charging a fully discharged battery takes approx. 2 hours. In an emergency, the flashlight can be used while charging, but only the white 3 and 50 lumen modes and red modes will be available.

Low battery warning: If the battery voltage drops below the set level, the headlamp automatically switches to lower power modes. If the headlamp is already switched to the lowest power mode and the battery is critically low, the indicator in the button will start flashing red. However, the headlamp will continue to shine until the battery is completely drained. Note: the low battery warning is calibrated only to the voltage of rechargeable Li-ion batteries.

Locking the headlamp against accidental activation: Loosen the battery cap of the headlamp by a quarter turn; this breaks the electrical contact and the headlamp cannot be turned on. The button can also be locked electronically – with the headlamp off, hold the button down for 3 seconds. After locking, the flashlight flashes red. To unlock, hold the button again for 3 seconds.

Warning

• Keep this headlamp out of the reach of children.
• Do not shine the headlamp directly into anyone's eyes.
• Do not disassemble the sealed part in the head of the flashlight yourself; this will void the warranty.
• Lock the headlamp or remove the battery to prevent accidental activation if the headlamp is placed in an enclosed and flammable environment, such as pockets and backpacks!
• Do not shine on flammable objects from close range to avoid damaging them or creating a hazard due to high temperature.
• In case of using a disposable CR123A battery, do not try to charge it in the flashlight.
• If the protective rubber rings appear damaged after prolonged use, replace them. The rings also need to be lubricated to prevent rubber erosion. By following these rules, the flashlight will be properly protected against water.
• If the flashlight flashes, does not switch to higher power modes, or does not light up, it may be due to one of the following reasons:
  • The battery is almost discharged – charge it or replace it.
  • The contacts inside the flashlight are dirty – clean them with a cotton swab dipped in alcohol.
  • The rear part of the flashlight is loose – tighten it.