Fenix LD45R Reference ManualUpdated an hour ago

The Fenix LD45R is a digital focusing rechargeable flashlight. This summary is drawn from the manufacturer's official user manual — see the downloadable PDF reference manual on the product page for complete details.

Overview

2800 lumens maximum output and 480 meters maximum beam distance.
Utilizes one Luminus SFT70 LED with a lifespan of 50,000 hours.
Includes a Fenix ARB-L21-5000 V2.0 rechargeable battery.
270° rotatable toggle switch allows for accurate adjustment between spotlight and floodlight.
Electronic switch controls output selection, SOS mode, and Strobe mode.
OLED smart display shows the brightness level, output, charging status, and battery level.
Neck-mounted USB Type-C charging port with inner waterproof treatment.
Made of durable A6061-T6 aluminum alloy material.
Premium type HAIII hard-anodized anti-abrasive finish.
Reverse polarity protection, to protect from improper battery insertion.
Size: 6.11" x 1.75" x 1.26" / 155.3 x 44.5 x 32 mm.
Weight: 10.65 oz / 302 g (including battery).

Operating Instructions

On/Off: Press the electronic switch for 0.5 seconds to turn the light on or off.

Mode Switching: With the light unlocked, press and hold the electronic switch for 1.2 seconds to enter Flash Mode. Press and hold the electronic switch for 1.2 seconds again to return to the last selected output of General Mode.

Output Selection: General Mode: with the light switched on, single click the electronic switch to cycle through Eco → Low → Med → High → Turbo. Flash Mode: with the light unlocked, press and hold the electronic switch for 1.2 seconds to enter Strobe; single click the electronic switch to cycle through Strobe → SOS.

Spotlight and Floodlight Adjustment: Rotate the toggle switch to adjust between spotlight and floodlight.

Lock: With the light switched off, double click the electronic switch to lock it — the light will blink twice in Eco mode and the OLED smart display will show a lock icon to indicate the locked status.

Unlock: With the light locked, double click the electronic switch to unlock it — the OLED smart display will show an unlock icon and the light will be activated in Eco mode to indicate the unlocked status.

Note: In the locked status, clicking or pressing the electronic switch will activate 2 blinks in Eco mode; the OLED smart display will show the lock icon and battery level to indicate the locked status.

Intelligent Memory Circuit

The flashlight automatically memorizes the last selected output of General Mode. When turned on again, the previously used output of General Mode will be recalled.

Intelligent Overheat Protection

The light will accumulate a lot of heat when used at high output levels for extended periods. When the light reaches a temperature of 60°C/140°F or above, it will automatically step down a few lumens to reduce the temperature. When the temperature drops below 60°C/140°F, the light automatically recalls the previously used output level.

Battery Level Indication

With the light switched off, single click the electronic switch and the OLED smart display will show the battery level for 3 seconds. With the light switched on, check the battery level icon on the OLED smart display to view the battery level.

Low-Voltage Warning

When the voltage level drops below 3.0V, the flashlight is programmed to downshift to a lower brightness level until Eco output is reached. When this happens in Eco output, the battery level icon on the OLED smart display flashes to remind you to replace or recharge the battery. To ensure normal use, the flashlight will not turn off automatically and will work till the battery level runs out.

Charging

Open the anti-dust cover to reveal the charging port, then connect the USB Type-C end of the charging cable to the flashlight.
When charging, the OLED smart display will automatically show the charging icon and the battery level to indicate the charging status.
Once charging is completed, be sure to unplug the charging cable and close the anti-dust cover to maintain the dustproof and waterproof ability.

Notes: 1) The normal charging time of the included Fenix ARB-L21-5000 V2.0 rechargeable battery is approximately 3 hours from depletion to fully charged with a 5V/2.5A charging adapter. 2) Recharge a stored light every four months to maintain the optimum performance of the battery. 3) While charging, the Eco mode of the flashlight can be operated, and the OLED smart display will show a warning icon when the battery is inserted backward or not inserted at all.

Battery Specifications

Fenix ARB-L21-5000 V2.0, 21700, 3.6V — Recommended.
Fenix ARB-L21-6000, 21700, 3.6V — Recommended.
Fenix ARB-L21-4000P, 21700, 3.6V — Recommended.

Note: only Low output and Eco output can be operated when using a Fenix ARB-L21 series battery not listed above. 21700 Li-ion batteries are powerful cells designed for commercial applications and must be treated with caution and handled with care. Only using quality batteries with circuit protection will reduce the potential for combustion or explosion; cell damage or short-circuiting are considered user-induced damage and are not covered by any Fenix warranty or liability.

Battery Replacement

Unscrew the light tail and insert the battery with the anode side (+) towards the light head, then screw the light tail back on.

Usage and Maintenance

Disassembling the sealed head can cause damage to the light and will void the warranty.
Fenix recommends using an excellent-quality battery.
If the light will not be used for an extended period, remove the battery, or the light could be damaged by electrolyte leakage or battery explosion.
Turn off and lock the flashlight, or remove 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 light's performance, as dirty contacts may cause the light to flicker, shine intermittently, or even fail to illuminate. A) Poor battery level: replace the battery according to the manufacturer's specifications. B) The threads, PCB board contact, or other contacts are dirty: clean the contact points with a cotton swab soaked in rubbing alcohol. If the above methods don't work, please contact your authorized distributor.

Warning

Do NOT place this flashlight in the reach of children.
Do NOT shine the flashlight directly into the eyes of anyone.
Do NOT place the light head near flammable objects — high temperatures can cause objects to overheat and become flammable or ignite.
Do NOT use the flashlight in inappropriate ways such as holding the unit in your mouth, as doing so could cause serious personal injury or death if the flashlight or internal battery fails.
This flashlight will accumulate a significant amount of heat while operating, resulting in a high temperature of the flashlight shell — pay close attention to avoid burns.
Loosen the tail cap or take out the battery to prevent accidental activation during storage or transportation.
The LED of this flashlight is not replaceable, so the whole flashlight will need to be replaced when the LED reaches the end of its lifespan.

Technical Parameters

Turbo: Output 2800 lumens*, Runtime 2 h 40 min**, Distance (Spotlight) 480 m / (Floodlight) 164 m, Intensity (Spotlight) 57,600 cd / (Floodlight) 6,750 cd
High: Output 1000 lumens*, Runtime 2 h 50 min, Distance (Spotlight) 289 m / (Floodlight) 101 m, Intensity (Spotlight) 20,900 cd / (Floodlight) 2,550 cd
Med: Output 350 lumens*, Runtime 6 h 40 min, Distance (Spotlight) 173 m / (Floodlight) 58 m, Intensity (Spotlight) 7,500 cd / (Floodlight) 900 cd
Low: Output 150 lumens*, Runtime 16 h 40 min, Distance (Spotlight) 113 m / (Floodlight) 38 m, Intensity (Spotlight) 3,200 cd / (Floodlight) 400 cd
Eco: Output 20 lumens*, Runtime 65 hours, Distance (Spotlight) 41 m / (Floodlight) 14 m, Intensity (Spotlight) 400 cd / (Floodlight) 50 cd
Strobe: Output 2800 lumens*
SOS: Output 150 lumens*

All modes: Impact Resistance 1 meter, Waterproof IP68. *The above specifications of output and runtime are from the results when the flashlight is adjusted to the maximum output of the spotlight with the most focused beam. **The Turbo output is measured as the total runtime including output at reduced levels due to temperature or the protection mechanism in the design. Parameters lab-tested by Fenix using one Fenix ARB-L21-5000 V2.0 battery at 21±3°C and 50%-80% humidity; actual performance may vary by environment and battery used.

Included

Fenix LD45R flashlight, ARB-L21-5000 V2.0 battery, USB Type-C charging cable, holster, lanyard, spare O-ring, user manual, warranty card.

Was this article helpful?

Yes