Nitecore P10iX

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Nitecore P10iX specifications

Brand/model	Nitecore P10iX
Category	Tactical flashlights
LED	4x Cree XP-L2 V6
Lumens	4,000 lm
Beam intensity	6,250 cd
Battery config.	1*21700
Material	Aluminum
Modes	6
Blinkies	Strobe
Reflector	Smooth
Waterproof	IP68
Review date	September 2021

Nitecore is no stranger to the flashlight market. They’ve been producing robust, high quality lights for at least 14 years. They have a very wide portfolio that they segment into different series: MH (Multi-task Hybrid), P (Precise), TM (Tiny Monster), T (products like the Tube, Tip, Tini, and Tiki), and so forth. My first ever high-output flashlight was Nitecore’s P12GT: a 1000 lumen throwy tube light. This first impression with Nitecore certainly didn’t disappoint.

Up for review is a new entry in Nitecore’s Precise lineup: the P10iX. For those trying to keep the numbers and letters straight, this is an upgrade to the P10 lights. The “i” indicates that this uses Nitecore’s unique i-Series battery (more on that later). The “X” signifies that this P10iX has “Xtreme Performance”. Sounds good, but we’ll see about that!
Are you having a case of déjà vu? Yup, me too. When I was asked about the P10iX, I started checking out Nitecore’s website about this light. I was thinking to myself “but I’ve already reviewed this light!” Nope, that was the P20iX.  Nearly everything is identical except for the size of the flashlight – this is essentially a shrunk-down P20iX. I like compact, though.  So let’s see how it stands up against its big brother, shall we?

Package quality.

The Nitecore P10iX arrived in a sturdy and attractive looking two-piece box. It was lined with dense foam with a just-right cutout for the flashlight. It may not be the fanciest packaging I’ve seen, but it’s very nicely done. Inside the box was:

• Nitecore P10iX
• 21700i battery (NL2150HPi)
• Spare o-ring
• Lanyard
• Pocket clip
• Tactical holster (NTH10)
• USB-A to USB-C charging cable
• 2*CR123 adapter
• Manual

The more and more I use 21700-based flashlights, the more I’m convinced that it’s about the perfect size (at least for my hands) in terms of grip-ability. Most 18650 lights, while pocket friendly, can almost be too slender, while 26650 lights are generally pretty chunky. That is to say, I feel like the Nitecore P10iX is a very comfortable size. The body is pretty smooth overall, but has plenty of rings and cutouts and such and provides good traction.

There are some indentations around the head that keep the light from rolling around too much. The power switch on the tailcap (a forward clicky) protrudes generously. This makes it easy to activate, but of course, means there’s no tailstanding. There’s a second switch in the tailcap that sits flush, referred to as the STROBE READY mode select button.

The Nitecore NTH10 Tactical Holster is included. It’s designed to fit on various belt sizes between 1 ½“ to 2 ½” as well as being compatible with the MOLLE system. The holster feels nice and sturdy and seems to function very well, allowing quick and easy removal of the flashlight. The other included accessories are pretty decent. The clip holds on firmly enough and can fit into 3 different positions on the P10iX, though none of them are deep-carry. The included lanyard is pretty standard, but the only place to put it is cinched down on the pocket clip. It seems like an odd arrangement to me, but it works if you need the lanyard.

In addition to the included accessories, Nitecore offers several other products that are compatible with the P10iX, such as the:

• NTR10 Tactical Ring Pro
• TSL10i Signal Light
• RSW2i USB-C Remote Switch
• Multiple gun mounts
• Multiple diffusers

Nitecore is very consistent when it comes to design, materials, and overall build. Outside of a few exceptions, you know that you’re going to get top-notch HAIII anodized aluminum (in black of course, is there anything else?) and a solid construction.  The P10iX falls right in line with this and feels very rugged. The finish is excellent, and installing and removing the pocket clip left no marks. The threads are nice and smooth. Even the USB-C port cover is designed to seal tightly and sits flush with the light, it doesn’t get in the way or get caught up or anything. Nitecore has given it an impact resistance rating of 2 meters. The attention to detail is great.

As far as warranty goes, Nitecore has your back with three levels of guarantee:

• Exchange and DOA/defective products locally within 15 days of purchase
• Defective / malfunctioning products will be repaired free of charge for 60 months
• Beyond 60 months, Nitecore will cover the cost of the labor and the end user is responsible for the cost of the parts

Many multi-emitter LED lights I see (especially small-medium ones) use TIR optics. Not so with the P10iX; it utilizes a smooth clover-leaf shaped reflector. Like many of their reflectors, Nitecores describes them as using “Precision Digital Optics Technology (PDOT)”. I can’t say exactly what that means for this light, but Nitecore says it means they pay close attention to the design of their reflectors. And I tend to agree that they produce a very usable beam.

Perfectly situated in the center of each opening is a Cree XP-L2 V6 LED. That “V6” is the output bin, meaning these are some of the brightest XP-L2’s available. Nitecore hasn’t stated a particular CCT for this light, but unless otherwise specified they generally use 6000K – 6500K LEDs. While that may not be everyone’s favorite CCT, it lines up with the general consensus for preferred temperature of their target market: law enforcement, patrol workers, search and rescue, etc.

This isn’t a secret, but the XP-L2 is one of Cree’s new “flip-chip” LEDs. These are very efficient, but are infamous for their tint shift (different colors visible in different areas of the beam). There’s no miracle going on here, I certainly see the cool white hotspot, surrounded by a greenish corona. It’s pretty okay outside, but it doesn’t look great on white walls. While there is somewhat of a hotspot, the 4 LEDs in their tiny reflector provide a very wide (floody) beam.

The LEDs and reflector are protected by a sheet of AR-coated glass. That arrangement is housed beneath a strike bezel.  Dimensions aside, this is one other departure from the P20iX design which has embedded beads of high strength silicon nitride ceramics in the bezel. The P10iX lacks these beads.

As I sat looking at the front end of this light, a thought came to me. What do you get when you cram 4 XP-L2 emitters really close together? An XHP70.2 LED. Really, that’s what an XHP70.2 is: 4 XP-L2 dies put together on the same substrate. I feel like Nitecore could have saved themselves a little bit of effort and used a single XHP70.2 instead of 4 XP-L2. Oh well

• Length:137.2 mm / 5.4 inches
• Head diameter: 25.4 mm / 1.0 inches
• Body diameter: 25.4 mm / 1.0 inches

Weight: 

• Without cells: 80 grams / 2.8 oz
• With cells: 156 grams / 5.5 oz.

Flashlight comparison

Nitecore brothers, tactical flashlights, from left to right: Nitecore P20i UV, Nitecore P10iX, Nitecore P20iX

Common 21700 lights, from left to right: Amutorch E3, Sofirn IF25A, Nitecore P10iX, Sofirn SP35, Astrolux EC01

I feel like Nitecore made a great decision with the UI. There are two distinct UIs that you can choose from: Daily Mode and Tactical Mode. Switching between them is also very easy, while not being something you’d accidentally do.

So how do you do it? Glad you asked. Just unscrew the tailcap a little bit when holding down the Mode button. The light will blink at you, confirming the change. Then just tighten the tailcap back down.  

Daily Mode has 6 brightness levels plus Strobe. It cycles from low to high and has memory. Turbo cannot be memorized. In contrast, Tactical Mode has 4 brightness levels plus strobe. It cycles from high to low and does not use memory; the light always comes back on in Turbo (or Strobe via the Strobe Ready button).

Modes: Ultra-Low, Low, Mid, High, Higher, Turbo, Strobe

Daily Mode, From OFF:

• Power button, Half press: momentary on
• Power button, Single click: on in last used mode
• Mode button, Press and Hold: momentary Strobe

Daily Mode, From ON:

• Power button, Single click: turns off
• Mode button, Press and Hold: momentary Turbo
• Mode button, Single click: go to next mode
• Mode button, Triple click: Strobe mode

Tactical Mode, From OFF:

• Power button, Half press: momentary Turbo
• Power button, Single click: on in Turbo (no memory)
• Mode button, Press and Hold: momentary Strobe

Tactical Mode, From ON:

• Power button, Single click: turns off
• Mode button, Single click: go to next (lower) mode
• Mode button, Long press: Strobe mode

Mode memory:

• Daily Mode uses memory, Tactical Mode does not

Short cuts:

• To Turbo: In Tactical mode (only), the Power button goes right to Turbo
• To Strobe: from Off, the Mode button activates Momentary Strobe
• No other real shortcuts (though a shortcut to ultra-low would have been nice)

Low voltage warning:

• There is a power indicator LED on the side of the head that remains lit while the flashlight is on to read out the voltage range

Strobe/blinkies

•  Strobe mode only

Lock-out mode: 

•  No documented lockout besides physical lockout

PWM

•  PWM is not present in any mode. I used a photodiode circuit and my DMM’s Hz setting to verify.

Additional info: The P10iX employs Nitecore’s ATR (advanced temperature regulation) control scheme. In testing, it did a flawless job of keeping the flashlight under 60°C.

The Nitecore P10iX takes a 21700i battery. Note that little “i” there? That’s important. The P10iX won’t take just any 21700. It needs to be Nitecore’s i-Series 21700 cell. While some proprietary cells I’ve seen recently have Neg ring around the Pos terminal, Nitecore takes it a step further: they do this at both ends of the cell. Kinda slick. But also very unique, very proprietary.  

That said, if you’re in a pinch, Nitecore included a 2*CR123 adapter that you can use instead. Just know that you’re going to lose both Higher and Turbo modes. The highest claimed output using 2*CR123 is 1060 lumens.

The P10iX has built-in USB-C charging. It’s great to see USB-C finally taking over on charging ports. And while the P10iX ships with a USB-A to USB-C cable, it is compatible with USB Power Delivery (USB-C to USB-C) chargers. In testing, I observed a charge rate around 1.99A at 4.98V for 9.92 watts. Charging took 3 hours and 27 minutes and terminated at 4.14 volts.

I was able to carefully orient the Nitecore battery in my Vapcell S4+ charger. It fit just fine and charged as expected. If you try this, make sure you don’t short out the battery contacts on the charger contacts.

There’s a power indicator LED on the side of the head. While the flashlight is on, it’ll shine steady when the battery is above 50%. It’ll flash slowly below 50% and flash rapidly below 10%. But wait, there’s more!  When you insert the battery or remove the charging cable, the power indicator LED will blink out the actual voltage just like what you’d see with Anduril (firmware found in other popular flashlights). For a 4.2V battery, it’ll blink 4 times, pause, and blink 2 times. Nice!

For current measurements, an ANENG AN8008 multimeter and UNI-T UT210E clamp meter were used. Lux was measured by a UNI-T UT383 BT at 5 meters. Lumens were measured in a homemade lumen tube using a TSL2591 sensor, calibrated with a Maukka calibration light. The temperature was monitored with a MLX90614 IR temperature sensor. The included Nitecore battery was used for testing.

Lumen measurements (for each mode)

Mode	Specs (lm)	10min	30 sec	start
Ultralow	2	–	–	1.4
Low	50	–	–	48
Mid	300	273	277	279
High	850	665	782	801
Higher	1700	668 lm	1390 lm	1674 lm
Turbo	4000	596 lm	566 lm	4223 lm

Runtime graph

I ran full runtime tests on the brightest 4 of the 6 modes (the other two would take a very long time and be quite boring).

In Daily Mode, Turbo is only momentary. So flipped over to Tactical Mode to run the Turbo test. It started out at 4223 lumens, but quickly started stepping down around 20 seconds. It dropped to around 596 lumens and stayed around there, likely being controlled by the ATR. It stayed just around 51°C. The ATR never failed in this or any of the other tests. I measured 566 lumens at 30 seconds, so the ANSI runtime actually stops when the light drops below 57 lumens (10% of the 30 second reading). So the runtime was 3 hours and 26 minutes. The maximum temperature was 52.6°C.

The “Higher” mode was pretty similar to Turbo, it just started out a little less bright and took longer to step down. It started out at 1674 lumens and was at 1390 at 30 seconds. It began ramping down around 20 seconds and settled in around 571 lumens. It took 3 hours and 32 minutes to reach 10%.

High mode started out at 801 lumens and ramped down a little bit over the first 23 minutes. Output at 30 seconds was 782 lumens and it took 3 hours and 35 minutes to reach 10%.

Mid mode started out at 279 lumens and was at 277 at the 30 seconds mark. It crossed the 10% threshold at 8 hours and 27 minutes.

Throw numbers: 

For the throw measurements, I tested the P10iX Max at 5 meters using my UNI-T UT383 BT and a calibration factor based on the Maukka calibration light.

Mode	Specs	Candela measured	Meters	Yards
Ultralow	3 cd	–	–	–
Low	74 cd	–	–	–
Mid	485 cd	–	–	–
High	1,280 cd	1,675	81	89
Higher	2,610 cd	3,575	120	131
Turbo	6,250 cd	8,700 cd	187	205

With 4 closely spaced XP-L2 emitters in small / shallow reflectors, the Nitecore P10iX is definitely a floody light.

Beam shots of the building are taken at 15 m (16 yd) using a Pixel 3 set to ISO 200 with 1/10 second exposure time

Beam shots of the playset are taken at 30 m (33 yd) using a Pixel 3 set to ISO 200 with 1/2 second exposure time. The trees in the background are around 65 m away.

• Nitecore P10iX
• Nitecore P20iX
• Nitecore P20i UV
• Sofirn IF25A
• Meote FM1

Disclaimer: This flashlight was sent to me for review at no cost by Nitecore. I have not been paid to review, nor have I been holding back on problems or defects.