Fenix LR35R Pro

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Fenix LR35R Pro Specifications & measurements

Brand & Model	Fenix LR35R Pro
Flashlight category	Long Range, Lumen Monster
Battery config.	2*21700
Switch type	Side only
Dimensions:
Length	143 mm
Head diameter	55 mm
Weight with battery	462 g
LED & Beam
LED type	4x Luminus SFT25, 8x Luminus SST25, 2x OSRAM GR QSSPA1.23, 1x Luminus SST-10-UV
High CRI	No
Focusable beam	No
Features
Onboard charging	USB-C
Power bank	Yes
Specifications and measurements
Specified output	10,000 lm
Measured output (30sec)	15,521 lm
Max. measured output	16,404 lm
Specified beam distance	500 m
Measured beam distance (30sec)	499 m
Specified beam intensity	62,260 cd
Measured beam intensity (30sec)	62,325 cd
Overall rating	5 stars
Review publication date	September 2025

Fenix is no stranger in the flashlight world. They’ve been around since 2001 and make a huge array of high-quality, dependable flashlights. Fenix focuses on the professional market and those that truly rely on the utility of a lighting product. I’ve recently seen forum posts of people saying things like “but I could buy four lights from [budget brand] for the price of a Fenix!”.

They may be right (likely a bit exaggerated), but when you’re on the job, or deep in the woods – you just need your flashlight to be 100% reliable. That’s one of the things I really like about Fenix. From my experience, Fenix lights are really well designed, they use quality materials and finishes, have great constant-current drivers, and publish truthful ANSI specs. And they just work, period.

Today’s flashlight for review is the LR35R Pro, a recent entry in Fenix’s Long Range (LR) portfolio. I have reviewed a couple other LR lights in the past (the LR50R and LR40R V2.0), and those were massive flashlights. This one isn’t tiny, but it’s a lot more manageable in the hand. This dual-21700 flashlight features spotlight and floodlight, with bonus red and UV emitters. The Fenix LR35R Pro packs a punch. 

To get started with the Fenix LR35R Pro, twist off the head of the flashlight and remove the white insulation disc. Put the head back on and you’re ready to roll.

What’s in the package

For a flashlight in this price range, you expect nice packaging even if the packaging really isn’t all that big of a deal. Fenix did not disappoint! The LR35R Pro arrived in a moderately large, two-piece nested box with plenty of images, designs, and information on the outside. On the inside was a dense foam, custom-cut for this application. Foam aside, the box contained:

• Fenix LR35R Pro
• Two 21700 batteries (ARB-L21-6000)
• Holster
• Lanyard
• Charging cable
• Spare o-ring
• Literature

Size-wise, I consider the LR35R Pro to be comfortable to hold and use. I feel like multi-cell flashlights can be hit-or-miss in terms of comfortability – some of them are just too wide/thick. With this Fenix being two 21700s placed side-by-side in a flat design, it sits nicely in the palm of your hand. For carrying it around, the LR35R Pro comes with a sturdy pocket clip preinstalled.

It is blended into the tail of the flashlight, but it looks as if you could remove it with a small Torx bit if you’d like. Because the head is so much wider than where the pocket clip sits on the side of the flashlight, getting it to clip onto your pocket can be a two-handed affair.

Fenix included a nice thick lanyard which can attach to one of two ridges on the sides of the tail of the flashlight. Finally, a holster was included in the package. If I were going to carry the Fenix LR35R Pro around a lot (say, for your work as a security guard), I would definitely make use of the holster.

Operating the switches of the Fenix LR35R Pro is as natural as the grip on the flashlight. Your thumb instinctively lands on the electronic switch, which sits in the middle of the rotary toggle switch. Rotating the ring allows you to lock/unlock the flashlight and ramp up/down in stepless dimming. You can also use the e-switch to power the LR35R Pro on/off, though that is done through a long press.

The build quality, like pretty much any Fenix flashlight I’ve ever had, is top-notch. I don’t see where Fenix has given any particular specs on the materials used in the construction of the flashlight. The anodizing looks perfect and is probably like most other Fenix lights, HA Type III.

The LR35R Pro boasts an IP68 rating and 1 meter drop rating. One thing I noticed that speaks to Fenix’s attention to detail are the threads on the body tube. Not only are they chunky, solid, and very smooth, but it looks like Fenix staff have fine-tuned the last of the threads to make sure that the head is clocked to the body in the exact right position.

This powerful, long-range search light isn’t something that I would just clip onto my pocket and EDC. No, this is something for when you know you’re going to need some serious illumination power. The LR35R Pro should be right at home for patrol work, security guards, searching, and hunting.

If you go on nighttime expeditions in the woods or fields (hunter, farmer, etc) – this could be right up your alley, too. With the built-in UV light, it would also be handy for machinery inspections, bodily fluid detection, and perhaps finding scorpions. The high-output red light is handy for nighttime excursions where you’d like to minimize the impact to your dark-adjust eyes (or to keep from scaring wildlife).

Warranty:

• 15 days free replacement for manufacturing defects
• 5 years free repairs for problems the develop with normal use
• Limited Lifetime Warranty: for lights past the free repair warranty period, Fenix will provide lifetime repairs but will charge for parts.

The bezel of the Fenix LR35R Pro is likely stainless steel, robust, and comes with three tungsten steel beads embedded in it that would be handy for glass-breaking situations and perhaps some close-quarters defensive situations. The bezel is holding a glass lens in place, which in turn protects the smooth reflector.

The reflector consists of four completely separated cups for the spot LEDs in the center. Situated in a ring around those are eight flood LEDs. And then there are four specialty ones spaced 90° apart: a UV LED, two red ones (directly across from each other), and an IR distance-sensing emitter/receiver pair.

The distance sensor provides a safety function that will decrease the light output to around 50 lumens if the head of the LR35R Pro comes within 60mm of an object for more than 1.5 seconds. It will automatically resume the normal output level when you move the light away from the nearby object. This functionality can be enabled/disabled as desired (default: enabled) by locking the flashlight and holding the electronic switch for 6 seconds.

The four primary emitters that Fenix went with are Luminus SFT25 LEDs. These are relatively new and fairly popular among manufacturers lately. The SFT25 is a domeless emitter with a round die, producing a fairly clean, throwy beam.

The distinct hotspot is very even – I can’t even tell that this is a multi-emitter flashlight until I look at the very edges of the spill. The floodlight output is powered by eight Luminus SST25 LEDs, which are traditional domed, square-die emitters. The red channel uses two OSRAM GR QSSPA1.23 LEDs, while the UV capability is handled by a Luminus SST-10-UV.

The UV output wavelength is 365nm, which is great for a lot of things like currency detection, looking for bodily fluids, or machinery fluid leaks. With the domed LED sitting in a tiny little opening, the UV beam is very broad. I tried the UV against a US $20 bill and it lit up the security strip brilliantly.

The red output is a lot brighter than many other flashlights with a secondary red channel. On other lights, they generally provide just enough red illumination to read things up close like a map. The 260 lumens provided by the LR35R Pro, while floody, are bright enough to navigate a hiking trail.

More details: 

• LED Type: 4x Luminus SFT25, 8x Luminus SST25, 2x OSRAM GR QSSPA1.23, 1x Luminus SST-10-UV 
• High CRI: No
• Focusable beam: No

Spectral measurements: 

I used a Opple Light Master to measure the flashlight at 5 meters distance. 

Mode:	CCT:	CRI Ra:	duv
Flood	5713 K	66.4	+0.0072
Spot	6415 K	68.2	+0.0037
Spot+Flood	6138 K	67.4	+0.0049

Dimensions: 

Fenix LR35R Pro	Millimeters	Inches
Length	143 mm	5.6 in
Head diameter	55 mm	2.2 in
Body diameter	46 mm	1.8 in

Dimensions are rounded to the nearest millimeter and the nearest tenth of an Inch.

Weight: 

Fenix LR35R Pro	Weight in grams	Weight in oz
Without battery:	308 g	10.9 oz
With battery	462 g	16.3 oz

Weight is rounded to the nearest gram and tenth of an Oz.

Flashlight size comparison with its competition:

Group 1: Fenix LR35R Pro, Fenix LR50R, Fenix LR40R V2.0

Group 2: Fenix LR35R Pro, Fenix TK35R

Group 3: Fenix LR35R Pro, Armytek Barracuda Pro Max, Manker MK39 II Ranger

The dual switch (rotary + electronic) setup on the Fenix LR35R Pro is pretty easy to get the hang of. If you have the flashlight unlocked with the rotary switch and want to use the e-switch for on/off, that uses long presses. Normally, I’m not a fan of hold-for-off situations, but in this case that frees up the single-click action for switching between the spot/flood/combo channels. I think it’s a reasonable trade-off.

Available modes: 

• White channel: spot, flood, or combo – stepless dimming
• Red channel: stepless dimming
• UV channel: stepless dimming

Available blinky modes:

• Strobe (white), SOS (white), red flash
  

From OFF:

• Locked, double click e-switch: red / red flash / UV output (memorized)
• Locked, twist rotary switch: unlock and turn on white output
• Unlocked, press and hold e-switch 0.5 sec: white output
• Unlocked, press and hold e-switch 1.2 sec: strobe
• Unlocked, single click e-switch: battery indicator
• Unlocked, double click e-switch: red / red flash / UV output (memorized)

From ON:

• Twist rotary switch: change brightness
• Twist rotary switch counterclockwise until it clicks: lock
• Press and hold e-switch 0.5 sec: turn off
• Press and hold e-switch 1.2 sec: Strobe
• White output, single click e-switch: change between spot, flood, combo
• Strobe, single click e-switch: SOS
• Red/UV output, single click e-switch: change between red, red flash, and UV

Mode memory:

• Yes, brightness that is selected via the rotary switch is memorized when you turn the light off and back on using the e-switch
• Yes, the spot/flood/combo and red/red flash/UV outputs are also memorized

Shortcuts:

• To Low: twist the rotary switch counterclockwise as far as it can go without clicking (can be done with the light off)
• To Turbo: twist the rotary switch clockwise as far as it can go (can be done with the light off)
• To Strobe: press and hold e-switch 1.2 sec

Strobe/blinkies

• Strobe: press and hold e-switch 1.2 sec
• SOS: from Strobe mode, single click the e-switch
• Red flash: double click from Off; if not in red flash, click the e-switch until you get there

Lock-out feature: 

• Twist rotary switch counterclockwise until it clicks

Unscrew to Lock-out:

• Yes, you can physically lock out the flashlight with a quarter turn of the head

PWM

• None detected

Additional/summary info on the UI: 

• I feel like this description of the UI makes it seem a lot more difficult to use than it really is. Overall, it’s pretty quick to pick up on these controls.

The Fenix LR35R Pro takes two 21700 batteries. It comes as a kit with a pair of Fenix ARB-L21-6000 cells which are of the protected, button-top variety. Interestingly, the light does function ok with just one cell in, if you find yourself in a pinch with just one battery.

However, it must be a button-top cell. I tried a flat-top Samsung 40T that I had, and it was a no-go. I popped in a solder-blobbed 40T and it worked just fine. This is because while the tail has spring contacts for the batteries, the head simply has flat metal contacts that are ever so slightly recessed.

Charging is done through a USB-C cable that gets plugged in on the head of the flashlight, opposite of the buttons. The LR35R Pro accepts most fast-charging protocols including PD3.0 and PD2.0, with a max charge current of 3A (2.5A for 5V sources). Fenix says a complete charge cycle should take 4 hours. When hooked up to my 45W PD/PPS adapter, it charged at a max rate of 17.1W, with an average charge time of 3h 42m.

The LR35R Pro can also function as a power bank. I used a USB-C to USB-C cable and hooked it up to my Android phone, and it started fast charging it right away. When it is being used as a powerbank, the battery indicator lights illuminate and show a depleting animation. You can even use the flashlight while it is being used as a power bank, but at a reduced output (capped at 900 lumens, per Fenix).

Battery level indicator:

• Five LEDs: 80-100%
• Four LEDs: 60-80%
• Three LEDs: 40-60%
• Two LEDs: 20-40%
• One LED: 1-20%

Batteries	Details
Compatible batteries	Button-top 21700
Incompatible batteries	Flat-top cells
Low voltage protection/warning	Single blinking indicator LED
Onboard Charging:
Onboard charging	USB-C
Power bank functionality	Yes
USB-C to USB-C charging	Yes
Max power of USB charger (port)	45 watts
Max power measured	17.1 watts / 12.06V 1.42A
Final battery voltage (charged)	4.19V
Avg. onboard charge time	3h 42min

Lumen measurements

How Lumens are Measured: Understanding ANSI FL1 Standards How Lumens are Measured: Understanding ANSI FL1 Standards: The ANSI FL1 standards specify that output in lumens should be measured 30 seconds after turning on, as this is the standardized time for measuring brightness according to the industry standard. This is why we focus on this part in our measurements. The ANSI FL1 standards require an ambient temperature of 22 ± 3°C. We record the ambient the ambient temperature to identify potential reasons for any observed discrepancies.

Lux was measured by a UNI-T UT383 BT at 5 meters. Lumens were measured in a homemade lumen tube using a VEML7700 sensor, calibrated with a calibration light provided by 1Lumen. The included two Fenix 21700 batteries were used in the tests.

Mode	Specified output	Turn on	30 sec.	10 min.
Red Low	10 lm	9 lm	9 lm	9 lm
Red High	260 lm	291 lm	289 lm	284 lm
Spot Low	30 lm	31 lm	31 lm	31 lm
Spot High	5,000 lm	6,907 lm	6,361 lm	2,146 lm
Flood Low	50 lm	46 lm	46 lm	46 lm
Flood High	8,000 lm	10,064 lm	9,638 lm	2,193 lm
Spot & Flood Low	80 lm	73 lm	72 lm	72 lm
Spot & Flood High	10,000 lm	16,404 lm	15,521 lm	2,324 lm

*Turn-on and 30 second measurements are done manually, while the 10-minutes readings comes from the runtime graph. This is our standard approach, though some reviewers may choose a different approach.

Ambient temperature during testing:

• 23 °C 

Parasitic drain:

• 84 µA

I can usually count on Fenix to be spot-on with their lumen and intensity numbers. In this case, my numbers on the high end didn’t line up with Fenix’s claims – they crushed them! I was expecting around 10,000 lumens for the Spot & Flood combo at 30 seconds, and instead ended up with a 50% number. The Flood and Spot individual channels were also higher than expected, but not quite as drastic.

I like that even after dropping down, the Fenix LR35R Pro puts out over 2,000 lumens for the next couple of hours – a very usable brightness. Do watch out though, the temperature regulation is good for that initial drop, but with sustaining 2,000 lumens, the light does get toasty to the touch.

Battery Life: Runtime graphs

How Runtimes are Measured: Understanding ANSI FL1 Standards About ANSI FL1 runtime standards: The runtime is measured until the light drops to 10% of its initial output (30 seconds after turning on). This does not mean that the flashlight is not usable anymore. The last column shows how long the light actually works till it shuts off. If there is a + symbol, it means that the test was stopped at that particular point, but the light was actually still running. This happens on certain occasions, with certain drivers, firmware, or batteries.

Mode	Specified runtime	Runtime (ANSI FL1)	Time till shut off*
Red Low	290h
Red High	6h 49min
Spot Low	135h
Spot High	2h 43min	2h 34min	11h 50min
Flood Low	103h
Flood High	2h 40min	2h 33min	11h 44min
Spot & Flood Low	61h
Spot & Flood High	2h 38min	2h 28min	9h 44min

*The last column reflects the total runtime until the light turns off. A “+” symbol indicates that the test was stopped at that point, but the light continued to run. This typically occurs with certain drivers, firmware, or battery types.

Unlike the lumen tests, the runtime durations were pretty bang-on with the spec sheet. At least the ones I tested. I wasn’t about to try the Spot Low or Red Low durations – hundreds of hours is great (especially off the grid or in an emergency) but not when you’re running tests.

One other thing worth mentioning is just how long the LR35R Pro continues to run even after dropping below the 10% threshold. It runs for hours and hours at around 75 lumens. Not super bright, but enough to get you by in a pinch if you can’t recharge just yet.

I compared the Fenix LR35R Pro against some other recent powerful spot+flood lights, albeit with widely varying battery capacities:

• Lumintop DF11: the Lumintop clocks in with extreme brightness, over 22,000 lumens, but it drops off rapidly around 30 seconds and then goes to 1300 lumens for over 5 hours before slowly ramping down. While it is brighter than the LR35R Pro initially and has a longer runtime, I like that the Fenix stays over 2000 lumens before dropping down due to low voltage.
• Manker Ranger MK39 II: much like the Lumintop, the Manker starts off ultra bright, over 24,000 lumens. It hangs on a bit longer, though, and doesn’t have a large drop until the 1 minute mark. The MK39 II also has about half the sustained brightness of the Fenix, for a much longer runtime though.
• Nitecore EDC37: the Nitecore is an interesting light, but it’s really in a different weight class. The EDC37, as the name implies, could be an EDC light due to its compact design. As such, it is nowhere near as bright as LR35R Pro, and it has a drastic drop-down at only 9 seconds into the run. Oh, and this LUMIN SHIELD™ mode only works while you’re holding the button down (momentary activation).

Peak beam intensity and beam distance measurements

About Peak beam intensity: Understanding ANSI FL1 Standards About peak beam intensity The calculated value of distance in meters at which the flashlight produces a light intensity of 0.25 lux. (0.25 lux is about the brightness of a full moon shining on an object). This means that the intensity has decreased so much, it becomes difficult to see darker objects, or objects that don’t reflect light. The columns ‘Meters’ and ‘Yards’ use rounded numbers.

Intensity was measured at 5 meters after being turned on for 30 seconds. A UNI-T UT383 BT lux meter was used.

Mode	Specified intensity	Specified beam distance	Candela measured	Meters	Yards
Red	1,147 cd	68 m	1,325 cd	73 m	80 yd
Flood	11,333 cd	213 m	11,575 cd	215 m	235 yd
Spot & Flood	48,844 cd	445 m	52,375 cd	458 m	501 yd
Spot	62,260 cd	500 m	62,325 cd	499 m	546 yd

Ambient temperature during testing:

• 23 °C 

The Fenix LR35R Pro, despite being part of Fenix’s Long Range lineup, isn’t some ultra-long-range flashlight. It does put out a huge wall of light, though, especially when using the Spot & Flood combo mode. The LR35R Pro lights up everything around you and still puts a decent amount of light down range. Oh, and the test results? They’re unbelievably close to the spec sheet.

Camera settings and distance: Beam shots of the building are taken at 30 m (33 yd) using a Canon EOS R100 with a lens set to 18mm. Manual settings: ISO 800, 1/4sec, F4.5, 5000K.

Beamshots of the following flashlights compared:

• Fenix LR35R Pro – Spot & Flood
• Fenix LR35R Pro – Spot
• Fenix LR35R Pro – Flood
• Lumintop DF11 – Combo
• Lumintop DF11 – Spot
• Lumintop DF11 – Flood
• Manker Ranger MK39 II – Combo
• Manker Ranger MK39 II – Spot
• Manker Ranger MK39 II – Flood

Please note that the following beamshots are mainly intended to showcase the beam pattern and beam quality, rather than overall performance. These images are typically taken directly after activation, and in different seasons or weather conditions, and therefore do not fully represent its overall performance. In few cases the camera settings are even different and therefore not meant for performance comparisons. For accurate performance metrics, such as output, beam distance, and runtimes, you need to look at the performance section of this review.

Disclaimer: This flashlight was sent to us for review at no cost by Fenix. We have not been paid to review, nor have we been holding back on problems or defects.

Get 10% off every purchase at Fenix Lighting US, by using our exclusive 1lumen discount code: 1lumen10

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