Fenix LD36R User Manual & Reference GuideUpdated an hour ago

The Fenix LD36R is a high-performance multicolor 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

• 3600 lumens maximum output, 385 meters maximum beam distance.
• Utilizes three Luminus SFT25R Gen2 LEDs and three high-performance RGB LEDs, with a lifespan of 50,000 hours each.
• Powered by an included Fenix ARB-L21-6000 battery.
• Colorful light mode provides multiple atmospheric lighting effects for creating unique vibes.
• Stepless colorful light mode enables users to select their preferred light color to meet individual lighting needs with a single electronic switch.
• Toggle switch and electronic switch combination for easy and fast operation.
• ¼ inch threaded socket at the tail allows the light to be securely mounted on a tripod for hands-free illumination.
• Included diffuser tip converts the flashlight into a reading or atmosphere light for more application scenarios.
• Inner waterproof USB Type-C charging port.
• Reverse polarity protection, to protect from improper battery insertion.
• Made of durable A6061-T6 aluminum alloy material.
• Size: 5.50" x 1.57" x 1.04" / 139.6 x 40 x 26.5 mm.
• Weight: 8.15 oz / 231 g (including battery).

Operating Instructions

On/Off: When the toggle switch is set to Off, turn it to W or C to turn on the flashlight. When the toggle switch is already set to W or C and the flashlight is off, press and hold the electronic switch for 0.5 seconds to turn it on. With the light on, turn the toggle switch to Off, or press and hold the electronic switch for 0.5 seconds, to turn the light off.

Mode Switching: In any state, turn the toggle switch to select the needed mode — W indicates White light mode, and C indicates Colorful light mode or Colorful breathing light mode. When the toggle switch is set to W, press and hold the electronic switch for 1.2 seconds to enter Strobe mode; single click to recall the previously used output of White light mode. When the toggle switch is set to C, press and hold the electronic switch for 1.2 seconds to enter Stepless colorful light mode — continue holding until the desired light color appears, then release to lock it in. To change the color again, press and hold the electronic switch until the new color appears, then release to lock in the new color. Single click the electronic switch to recall the previously used output of Colorful light mode or Colorful breathing light mode. In Colorful light mode or Stepless colorful light mode, double click the electronic switch within 0.5 seconds to enter Colorful breathing light mode; single click to recall the previously used output of Colorful light mode.

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

Output Selection — Colorful Light Mode: With the light on, single click the electronic switch to cycle through Sunrise Red → Sunset Orange → Twilight Pink → Aqua Blue → Neon Purple → Arctic Green.

Lock: With the light turned off, double click the electronic switch within 0.5 seconds to lock it — the light will blink twice on Eco output to indicate the locked status.

Unlock: With the light locked, turn the toggle switch to W or C, then double click the electronic switch within 0.5 seconds — the light will activate on Eco output of White light mode, or on the previously used output of Colorful light mode or Colorful breathing light mode, to indicate it is unlocked.

Note: In locked status, turning the toggle switch and clicking or pressing the electronic switch will activate 2 blinks on Eco output to indicate the locked status.

Intelligent Memory Circuit

The flashlight memorizes the previously used output level and mode, excluding Strobe mode and Stepless colorful light mode. When turned on again, the previously used output level and mode will be recalled.

Battery Specifications

• Fenix ARB-L21 Series, 21700, 3.6V — Recommended.
• Rechargeable battery (Li-ion), 21700, 3.6V — Use with caution.
• Rechargeable battery (Li-ion) without protection board, 21700, 3.6V — Not permitted.

Warning: 21700 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 will reduce the potential for combustion or explosion.

Battery Replacement

Unscrew the light body and insert the battery with the anode side (+) towards the light head, then screw the light body 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 light.
• The indicator will display red while charging and will turn 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-L21-6000 battery is approximately 3.5 hours from depleted to fully charged with a 5V/2.5A charging adapter. 2) Recharge a stored flashlight every four months to maintain optimum battery performance. 3) When charging, all modes can be turned on except Turbo, Strobe, and Colorful breathing light; brightness levels may vary based on charging status and battery level.

Battery Level Indication

With the light turned off, single click the electronic switch to check the battery status; the indicator will last for 3 seconds. Each time the light is turned on, the indicator will show the current 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-L21 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 users to replace or recharge the battery in a timely manner. Note: this feature only works with a Fenix ARB-L21 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.
• Lock the light 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 light and battery contacts improves the light'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 LEDs of this flashlight are not replaceable, so the whole light will need to be replaced if any one of the LEDs reaches the end of its lifespan.

Technical Parameters

• White Light Turbo: Output 3600 lumens, Runtime 3h41min*, Distance 385 meters, Intensity 37100 candela
• White Light High: Output 1500 lumens, Runtime 3h55min, Distance 244 meters, Intensity 14900 candela
• White Light Med: Output 350 lumens, Runtime 10h15min, Distance 117 meters, Intensity 3400 candela
• White Light Low: Output 150 lumens, Runtime 28h58min, Distance 76 meters, Intensity 1450 candela
• White Light Eco: Output 30 lumens, Runtime 65h18min, Distance 35 meters, Intensity 300 candela
• White Light Strobe: Output 3600 lumens
• Colorful Light — Arctic Green: Output 330 lumens, Runtime 4h46min, Distance 39 meters, Intensity 400 candela
• Colorful Light — Neon Purple: Output 165 lumens, Runtime 4h58min, Distance 23 meters, Intensity 100 candela
• Colorful Light — Aqua Blue: Output 250 lumens, Runtime 4h51min, Distance 32 meters, Intensity 300 candela
• Colorful Light — Twilight Pink: Output 210 lumens, Runtime 4h58min, Distance 27 meters, Intensity 200 candela
• Colorful Light — Sunset Orange: Output 215 lumens, Runtime 4h58min, Distance 27 meters, Intensity 200 candela
• Colorful Light — Sunrise Red: Output 175 lumens, Runtime 4h57min, Distance 23 meters, Intensity 100 candela
• Colorful Breathing Light: Runtime 6h17min
• Stepless Colorful Light: output, runtime, distance, and intensity vary by selected color.

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-L21-6000 battery at 21±3°C and 50%-80% humidity; actual performance may vary by environment and battery used.

Included

Fenix LD36R flashlight, ARB-L21-6000 battery, USB Type-C charging cable, AOD-04 diffuser tip, holster, lanyard, spare O-ring, user manual, warranty card.