Fenix LD35R Reference ManualUpdated an hour ago

The Fenix LD35R is a three-light-source multipurpose 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

1800 lumens maximum output, 337 meters maximum beam distance.
Uses one COB light strip and one Luminus SST40 Gen2 LED, with a lifespan of 50,000 hours.
White, red, and blue light sources serve lighting needs for various occasions.
Main light plus side lights; side lights provide single-sided and dual-sided 360° lighting.
Powered by an included 3400mAh battery; also compatible with two CR123A batteries.
Toggle switch and electronic switch combination for easy, fast mode selection.
Magnetic tail for hands-free use.
Stainless steel strike bezel inlaid with ceramic breaking tips.
Inner waterproof USB Type-C charging port.
Boot-up battery level indication and low-voltage warning.
Reverse polarity protection, to protect from improper battery insertion.
Made of durable A6061-T6 aluminum alloy.
Premium type HAIII hard-anodized anti-abrasive finish.
Size: 5.37" x 1.34" x 1.35" / 136.4 x 34 x 34.5mm.
Weight: 6.53oz / 185g (including battery).

Operating Instructions

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

Mode Switching: Turn the toggle switch to select the needed mode — the main-light icon selects General mode (main light), R/B selects Red/Blue light mode (side lights), and the sun icon selects White light mode (side lights). With the light unlocked, press and hold the electronic switch for 1.2 seconds to switch to Strobe mode; single click again to return to the mode set by the toggle switch.

Output Selection — Main Light (General Mode): With the light turned on, single click the electronic switch to cycle through Eco → Low → Med → High → Turbo.

Output Selection — Side Lights (White Light Mode): With the light turned on, single click the electronic switch to cycle through Single-sided (Low) → Single-sided (High) → Dual-sided (Low) → Dual-sided (High).

Output Selection — Side Lights (Red/Blue Light Mode): With the light turned on, single click the electronic switch to cycle through Red constant-on → Red flash → Blue flash → Red & Blue flash → Red SOS.

Lock/Unlock: With the light unlocked, double click the electronic switch within 0.5 seconds to lock it — the flashlight will blink twice on Eco output to indicate the locked status. To unlock, double click the electronic switch again within 0.5 seconds; the flashlight will activate on the mode the toggle switch is set to, indicating it is unlocked.

Intelligent Memory Circuit

The flashlight memorizes the previously used output level, excluding Strobe mode, Red/Blue light mode, and White light mode (side lights). When turned on again, the previously used output level will be recalled.

Notes: 1) The flashlight will activate on Med output if it was previously turned off on Turbo or High output. 2) The side lights activate on Red constant-on if previously turned off in Red/Blue light mode, and on Single-sided (Low) if previously turned off in White light mode.

Battery Specifications

Fenix ARB-L18 Series, 18650, 3.6V — Recommended.
Non-rechargeable battery (Lithium), CR123A, 3.0V — Usable (no charging).
Rechargeable battery (Li-ion), 18650, 3.6V — Use with caution.
Rechargeable battery (Li-ion), 16340, 3.6V — Not permitted.
Rechargeable battery (LiFePO4), 18650, 3.2V — Not permitted.

Warning: 16340/18650 Li-ion batteries are powerful cells designed for commercial applications and must be treated with caution and handled with care. Using low-quality batteries or mishandling batteries (such as short-circuiting or overheating) could lead to combustion and jeopardize the safety of users and property. Any adverse effects resulting from the use of low-quality batteries are not covered by any Fenix warranty or liability; using quality batteries with circuit protection reduces the potential for combustion or explosion. Note: when using CR123A batteries, Turbo output cannot be activated, and Strobe mode outputs 800 lumens instead of 1800.

Battery Replacement

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

Charging

Turn off the flashlight and open the anti-dust cover to reveal the USB Type-C charging port, then connect the USB Type-C end of the charging cable to the flashlight.
The indicator displays red while charging and turns green when fully charged.
Once charging is completed, be sure to unplug the charging cable and close the anti-dust cover.

Notes: 1) The normal charging time of the included Fenix ARB-L18-3400 battery is approximately 3 hours from depleted to fully charged with a 5V/2A charging adapter. 2) Recharge a stored flashlight every four months to maintain optimum battery performance. 3) All modes except Strobe can be used while charging; brightness may vary depending on the charging status and battery level.

Battery Level Indication

With the light turned off, single click the electronic switch to check the battery status. Each time the light is turned on, the indicator will display the battery level for 3 seconds.

Green light on: saturated, 100% - 85%
Green light flashes: sufficient, 85% - 50%
Red light on: poor, 50% - 25%
Red light flashes: critical, 25% - 1%

Note: This feature only works with a Fenix ARB-L18 Series battery.

Intelligent Overheat Protection

The flashlight will accumulate a lot of heat when used at high output levels for extended periods. When the flashlight 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 flashlight will gradually recall the preset output level.

Low-Voltage Warning

When the voltage level drops below the preset level, the flashlight is programmed to downshift to a lower brightness level until Eco output is reached. When this happens at Eco output, the battery level indicator blinks red to remind you to replace or recharge the battery in a timely manner. Note: this feature only works with a Fenix ARB-L18 Series battery.

Usage and Maintenance

Disassembling the sealed head can cause damage to the flashlight and will void the warranty.
Fenix recommends using an excellent-quality battery.
If the flashlight will not be used for an extended period, remove the battery, or it could be damaged by electrolyte leakage.
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, since dirty contacts may cause the lamp to flicker, shine intermittently, or fail to illuminate. A) Poor battery level: recharge or replace the battery. B) Dirty battery or flashlight contact points: clean with a cotton swab soaked in rubbing alcohol. If neither resolves the issue, please contact the distributor.

Warning

Do NOT place this flashlight within the reach of children.
Do NOT shine the flashlight directly into anyone's eyes.
Do NOT place the light head near flammable objects — high temperatures can cause objects to overheat and ignite.
Do NOT use the flashlight in inappropriate ways, such as holding the unit in your mouth; 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 light shell — pay close attention to avoid burns.
Turn off and lock the flashlight, or remove the battery, to prevent accidental activation when the light is placed in a closed, flammable environment such as a pocket or backpack.
The light sources of this flashlight are not replaceable, so the whole light will need to be replaced when any one of the light sources reaches the end of its lifespan.

Technical Parameters

Main Light Turbo: Output 1800 lumens, Runtime 2h19min*, Distance 337 meters, Intensity 28400 candela
Main Light High: Output 800 lumens, Runtime 3 hours, Distance 217 meters, Intensity 11800 candela
Main Light Med: Output 350 lumens, Runtime 5h34min, Distance 143 meters, Intensity 5100 candela
Main Light Low: Output 100 lumens, Runtime 22h39min, Distance 78 meters, Intensity 1500 candela
Main Light Eco: Output 20 lumens, Runtime 101h54min, Distance 34 meters, Intensity 300 candela
Main Light Strobe: Output 1800 lumens
Side Lights — White Dual-Sided High: Output 150 lumens, Runtime 6h2min, Distance 10 meters, Intensity 25 candela
Side Lights — White Dual-Sided Low: Output 80 lumens, Runtime 6h13min, Distance 7 meters, Intensity 13 candela
Side Lights — White Single-Sided High: Output 30 lumens, Runtime 15h44min, Distance 6 meters, Intensity 10 candela
Side Lights — White Single-Sided Low: Output 5 lumens, Runtime 86h35min, Distance 3 meters, Intensity 3 candela
Side Lights — Red SOS: Output 15 lumens, Runtime 51h7min
Side Lights — Red & Blue Flash: Output 15 lumens, Runtime 31h28min
Side Lights — Blue Flash: Output 15 lumens, Runtime 30h26min
Side Lights — Red Flash: Output 15 lumens, Runtime 55h13min
Side Lights — Red Constant-on: Output 5 lumens, Runtime 60h37min

All modes: Impact Resistance 1 meter, Waterproof IP68. *The Turbo output runtime is the total accumulated time including output at reduced levels due to the built-in temperature protection mechanism. Parameters lab-tested by Fenix using one Fenix ARB-L18-3400 battery at 21±3°C and 50%-80% humidity; actual performance may vary by environment and battery used.

Included

Fenix LD35R flashlight, ARB-L18-3400 battery, USB Type-C charging cable, holster, lanyard, spare O-ring, user manual, warranty card.

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