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LR50R
The Fenix LR50R 12000 lumen flashlight is the definition of a high-performance spotlight. Blasting a maximum 12000 lumens, this flashlight can throw that light an incredible 3117ft (950m)—that’s over half of a mile. The Fenix LR50R’s most unique feature is its intelligent downshifting sensor which recognizes when the flashlight’s head is too close to an object and will automatically downshift the brightness level to avoid accidents due to excessive heat. The included li-ion battery pack not only powers its eight lighting modes, but you can also use its discharge function to charge other devices. Perfect for situations where maximum brightness over long distances is a must, the Fenix LR50R Rechargeable Flashlight will light up the night.
What’s the difference between the Fenix LR40R Flashlight and the Fenix LR50R Flashlight? Read more here >>
*Please note this light requires a wall charger that is at least 2 AMPS for proper charging.

Switches on the Fenix LR50R
The right switch is the main switch for on/off and output selection on general mode.
The left switch is the auxiliary switch for on/off and output selection on functional mode.
On/off
Press and hold either of the switches for 0.5 seconds to turn on/off the light.
Mode switching
In general mode, single click the auxiliary (left) switch to enter turbo on functional mode.
In functional mode, single click the main (right) switch to enter the previously used output on general mode.
Output Selection
In general mode, single click the main (right) switch to cycle through Eco→Low→Med→High I →HighII→Turbo.
In functional mode, single click the auxiliary (left) switch to cycle through Turbo→Strobe→SOS.
Lockout Function
Lock: With the the light switched off and unlocked, simultaneously press the two switches for 3 seconds, the light will blink 2 times on Eco to indicate locked status.
Unlock: With the light locked, simultaneously press the two switches for 3 seconds, the light will be activated on Eco.
* In locked status, clicking or pressing the switches will activate 2 one-second blinks to indicate locked status.
Instant Turbo / Strobe / SOS
With the light switched off, press and hold the auxiliary (left) switch for 0.5 seconds to enter instant turbo, single click the auxiliary once again to enter strobe and then SOS.
Intelligent Memory Circuit In general mode, the light memorizes the last selected output. When turned on again the previously used output of general mode will be recalled. In functional mode, the light will be activated on Turbo each time it is turned on, for emergency situations.
* The light does not have memory function if 21700 battery is used.
Battery Specifications of the Fenix LR50R 12,000 Lumen Flashlight
| Type | Dimension | Nominal Voltage | Usability | |
| Li-ion battery pack | Fenix ARB-L52-16000 | 3.6V | Recommended | √√ |
| Rechargeable battery (Li-ion) | 21700 * | 3.6V | Usable | √ |
| Rechargeable battery (Li-ion) | 18650 | 3.6V | Banned | × |
| Non-rechargeable battery (Li-ion) | CR123A | 3.0V | Banned | × |
* Warning: 21700 Li-ion batteries are powerful cells designed for commercial applications and must be treated with caution and handled with care. Using only quality batteries with circuit protection will reduce the potential for combustion or explosion; but cell damage or short circuiting are potential risks the user assumes.
Battery Replacement
Unscrew the light body to insert the battery with the anode side (+) towards the light head, then screw the light body back on.
Charging
Power Bank Discharge Function
Note:
Battery Level Indication
With the light switched off, single click either switch to check the battery status, which will last for 3 seconds.
Note: This only works with the included Fenix ARB-L52-16000 battery pack.
Intelligent Brightness Downshifting Sensor
The flashlight has a built-in intelligent sensing circuit. When the light surface is close to the lighting object (about 60mm) for more than 1.5 seconds, the flashlight will automatically downshift the output level to Eco to avoid danger caused by high temperature. When the light surface is more than 0.8 seconds away from the lighting object, the flashlight automatically recalls the previously used output level. *As objects of different materials and colors reflect differently to light, there will be slight deviations in the sensing distance.
Turning on/off Intelligent Brightness Downshifting Sensor
Intelligent Protection
Time-limited downshift
With the light switched on, if Turbo is being selected for over 20 seconds, the light will downshift until to 8000 lumens within 60 seconds.
With the light switched on, if High II is being selected for over 60 seconds, the light will downshift until to 4000 lumens within 60 seconds.
Note: The abovementioned functions are specially designed for avoiding discomfort and danger caused by overheating.
Overheat Protection
The light will accumulate a lot of heat when used on High I, High II or Turbo output level for extended periods. When the light reaches a temperature of 60°C or above, the light will automatically step down a few lumens to reduce the temperature. When the temperature drops below 60°C, it will then allow the user for the reselection of those modes.
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 in Eco output mode, the battery level indicator blinks to remind you to timely recharge or replace the battery.
Note: This only works with the included Fenix ARB-L52-16000 battery pack.
Usage and Maintenance of the Fenix LR50R 12,000 Lumen Flashlight
Warning
FAQs about LR50R Flashlight
Q1. What is the product positioning of LR50R? And who are the target customers?
A:The Fenix LR50R is a super bright flashlight made for search and rescue. The Fenix LR50R flashlight emits a truly remarkable output of 12000 lumens. Capable of 950-meter beam visibility, it can be used to find any object in the dark. Dual stainless steel side switches allow you to quickly activate and cycle through the general six brightness levels, and functional modes including instant turbo, strobe and SOS. With the included USB Type-C charging port you can fast charge the Fenix LR50R in a matter of hours, or use the discharge function to charge your other devices. Additionally, the 16000 mAh battery pack provides up to 58 hours of illumination on the Eco mode. The body of the LR50R is made from high-strength oxidation resistant aluminum that will last for many years. A special and user-friendly brightness downshifting sensor function is designed to avoid high temperature at close-range lighting. Choose between the versatile modes to easily adapt to your surroundings, this flashlight is the perfect tool for exploring and search and rescue.
Q2. What are the key features and benefits of LR50R?
A: 1) 12000 lumens maximum output; 950 lumens maximum beam distance.
2) Intelligent brightness downshifting sensor to avoid high temperature at close-range lighting.
3) Instant Turbo activation rapidly responds to emergency situations.
4) USB Type-C charging and discharging interface, supports PD3.0/PD2.0, QC3.0/QC2.0 fast-charging protocols.
5) Battery level indication for instant checking of remaining battery level.
Q3. What kind of LED's is used in LR50R?
A: 4 Luminus SST70 cool white LED's.
Q4. Does LR50R have overheat protection?
A: Yes. It has two types of intelligent protection.
Time-limited downshift
With the light switched on, if Turbo is being selected for over 20 seconds, the light will downshift until reaching 8000 lumens within 60 seconds.
With the light switched on, if High II is being selected for over 60 seconds, the light will downshift until reaching 4000 lumens within 60 seconds.
Note: The abovementioned functions are specially designed for avoiding discomfort and danger caused by overheating.
Overheat Protection
The light will accumulate a lot of heat when used on High I, High II or Turbo output level for extended periods. When the light reaches a temperature of 60°C or above, the light will automatically step down a few lumens to reduce the temperature. When the temperature drops below 60°C, it will then allow the user for the reselection of those modes.
Q5. What battery does the LR50R support?
A: The light includes a 3.6V/16000 mAh rechargeable LI-ion battery pack; and it is compatible with 1 to 4 21700 Li-ion battery.
Q6. What output will be activated when the light is unlocked?
A: The light will be activated on Eco.
Q7. What is the sensing distance of the Intelligent Brightness Downshifting Sensor?
A: It is approximately 60 mm. As objects of different materials and colors reflect differently to light, there will be slight deviations in the sensing distance.
Q8. What fast charging protocols does LR50R support?
A: The light and the included charging cable support PD3.0/PD2.0, QC3.0/QC2.0 fast charging protocols, the external adapter will be auto-detected if it supports the mentioned fast-charging protocols, if it does then 4.0A charging current will be selected, or 2.5A charging current will be selected.
Q9. Does LR50R have battery level indication?
A: Yes. But it only works with the included Fenix ARB-L52-16000 battery pack.
Q10. Is the LR50R internally waterproof?
A. Yes, the light is internally waterproof and is thus still waterproof without the port cover in place.
Q11: What should I do if the LR50R needs repair?
A: 1. 15-day replacement: Fenix will replace identical or equal products with documented manufacturing defects within 15 days of purchase.
2. 2-year free repair: Fenix will repair a light free of charge within 2 years of purchase if problems develop with normal use.
3. Lifetime maintenance: If repair is required after 2 years from the date of purchase, Fenix will charge for parts. The total repair fee is dictated by the cost of the replaced materials.
4. If you need warranty service, fill out the warranty form at https://www.fenixlighting.com/pages/warranty-repairs to start your repair claim.