This is the FireFlyLite X4 Stellar, an Anduril 2 flashlight with all the main enthusiast features you would want! A fantastic flashlight with many features done almost perfect. This one has 4 FFL351A LEDs in 5000K with 95 overall CRI and 90 R9, it comes with a Lume X1 Boost driver, USB-C charging with the best designed USB-C cover I’ve ever seen, AUX LEDs, tail magnet and much more!
• My opinion:
The X4 Stellar is really an almost perfect flashlight in my opinion, especially for enthusiasts. It has almost every single feature you would expect on a good flashlight, and it does every single one of them almost perfectly! One of the features that caught my attention the most was the USB-C charging port. It is the most awesome I have ever seen, the magnetic USB-C cover is easy to open and it closes automatically when you remove the charging cable, it doesn’t make the flashlight more water resistant though, but the USB-C port is already internally potted to prevent water ingress. The AUX LEDs are pretty good, but I wish they were brighter on the high brightness setting. This is a flashlight I can recommend without fear to you, if you don’t care for paying a bit more than budget flashlights.
I have to confess it was also hard to find things I disliked on this flashlight, the main ones being the lack of a more throwy TIR on the box, the X4Q 15-degree clear TIR lens would pack a punch on this thing; and the beaded TIR are very hard to swap, because the suction cup doesn’t work to remove them, it took me some time to swap the TIR the first time.
• Pros:
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Almost perfect “moonlight” mode
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FFL351A LED is pretty high CRI (95 CRI, 90 R9) and has a beautiful tint
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USB-C fully potted and water resistant
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USB-C magnetic cap is very convenient
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Button AUX is independent to the TIR AUX
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Efficient Lume X1 Boost driver
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Very customizable
• Cons:
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No throwy clear TIR option out of the box
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AUX LEDs could be brighter on high setting
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Beaded TIR is a little hard to swap
**- *** Turbo steps down fast, but this is expected on a high CRI high power flashlight like this
• Box contents
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X4 Stellar
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Extra 15-degree TIR lens
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Stainless-steel clip
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Stainless-steel lanyard ring
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Lanyard
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Extra O-rings
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Instructions manual
• Price
The X4 Stellar (2025 version) is currently $67.00 on the FireFlyOutoor official website! (not an affiliate link)
• Body and build quality
Colors/Material Options: This X4 Stellar is the “Timber Green” version, but it’s also available in “Navy Blue”, “Ember Red” and “Matte Black” on the Aluminum version. It’s also available in Titanium and Copper.
Material: The main body is made of 6063 Aluminum, it’s more resistant to corrosion and impact and more durable than the more common 6061 alloy. The bezel is made of stainless-steel with a smooth and shiny black “Multi-coated Black Diamond PVD” coating! The clip and lanyard ring are made of regular stainless-steel.
Main body: The battery tube has big squared shaped knurling with round edges, a more aggressive knurling than usual on flashlights, but it gives a nice grip to the flashlight. The head part has big heatsink “holes” for better heat dissipation, there are two bulges, one where e-switch is, the other where the USB-C port is. The tail cap is very simple, it can be unscrewed and a magnet is inside, on the threads a lanyard ring or a clip can be installed.
Threads: The head threads are squared; the tail cap threads are trapezoidal. Both are anodized.
Clip: The clip seems to be a new version, my X4Q Comet came with the original version, which is the one on the X4 Stellar pictures on the Fireflies website, but mine came with the 2-way clip, which I think is a little better than the original one.
Tail stand and rolling: The flashlight tail stand easily and is very stable because the tail cap Is solid and flat. It doesn’t roll much on a desk because the button and USB-C port bulges prevent rolling a lot, a clip or lanyard ring can be installed to prevent it even more.
AUX lights: The X4 Stellar has amazing AUX lights, they are RGB and you can control their brightness level and turn it off or into blinking mode. The AUX lights are located on the TIR lens and on the main button, the TIR ones are RGB and you can customize them, the button one is a fixed color and will also light up red when charging, mine came with a cyan AUX light on the button. It’s separate from the TIR ones, other than the X4Q which had a shared LED color with the TIR LEDs, this means the X4 Stellar button AUX will remain ON even if the flashlight is turned on, unlike the X4Q which turns off together with the TIR AUX. The AUX brightness mode is shared, so the button will be off if you turn the AUX off, low if you set the AUX to low brightness, and so on.
AUX Light comparision: The one at the back is the X4 Stellar, and the front one is the X4Q Comet
Buttons: The button is the same as most FireFlies flashlights, the nice e-switch covered by a stainless-steel black smooth PVD coated button! The X4 Stellar comes by default with the normal non-raised ring, which is actually slightly raised above the button, but not enough to prevent most accidental activations. The raised ring comes by default on the X4Q Comet, and you can also order it separately or ask for it to be installed for free when placing an order at FireFlies.
Bezel: The X4Q Comet bezel is an EDC type bezel, no protruding ends on it. It’s made of stainless-steel and has the same nice smooth black PVD coating as the button.
Battery contact: Contact is made with the battery by 2 nice springs, one on the head driver, the other on the tail cap. Both of them are Beryllium-copper springs silver plated for better electrical conductivity.
Water Resistance: It has IPX8 ingress resistance rating! I have to say, the X4 Stellar looks even more water resistance than the X4Q, especially on the bezel/lens part, it has 4 O-rings on there.
Size Comparison: Here is a size comparison with the Wurkkos TS26 on the left and the FireFlyLite X4Q Comet on the right.
As you can see the X4 Stellar is smaller than the TS26, almost the same size of the X4Q Comet, and it features USB-C charging, this adds a bulge on the opposite side of where the button is though.
• Weight and size
Weight:
- Without battery: 100.8g
-With battery (Molicel P50B): 170.9g
-Molicel P50B: 70.0g
Size: 107.1mm (length) x 36.2mm (head diameter - on button) x 27.5mm (tail diameter)
• Battery, runtime, and charging
Battery: The X4 Stellar is powered by a single 21700 battery, it has a 40W maximum power, so it is recommended to use a battery that has at least 15amp CDR; I used the Molicel P50B on the tests. 18650 cells can also be used, as long as they have a compatible CDR, I recommend getting an adapter to avoid the 18650 from rattling inside the tube if you do so.
Battery Indicator: It features battery indicator, both the Anduril blinkie mode “battery check” and the colored battery indicator from the AUX LEDs! Pretty nice. I think a good battery indicator is essential on every flashlight.
Charging: X4 Stellar features USB-C charging, and it’s one of the best I have ever seen on a flashlight! The charging is rated to 10W maximum for fast speed charging if needed; if the cell is below 3V it will start the charging with 100mA only, to preserve the battery and guarantee a good life span; also, when the battery is almost fully charged it will charge it very slowly for the same reason. If the flashlight is charging for more than 10 hours it will automatically stop the charging to avoid damage to the flashlight. The main button AUX LED will light up red when charging and will turn itself OFF when the charge is complete, it will also start blinking if the battery is inserted incorrectly.
The USB-C port it internally potted to prevent water ingress and the outside USB-C cover is magnetic and goes in to place automatically when you remove the charging cable, this prevents dust and other debris from going into the USB-C! One of the best designs I’ve ever seen!
• Modes, Runtimes, Throw, Candela:
Modes: This flashlight features Anduril, so you have many brightness levels and modes to choose from. These are the factory settings my flashlight came with (estimating the brightness by comparing to other flashlights I have): A1 is the “moonlight” mode, it has very close to 0.1 lumens, the B2 mode seems to have around 10 to 15 lumens, other modes will be increasing the brightness level until it reach the maximum of 2800 lumens (5000K version).
I will not enter into more detail on it because Anduril has a ton of options and it would extend much the review.
Throw: The 30-degree lens it comes with is pretty floddy, the 15-degree TIR too, but a little more throwy. With the standard 30-degree TIR it can achieve up to 265m as advertised by FireFlyOutdoor. I think this flashlight should have also come with a clear 15-degree TIR the X4Q comes with, because both lens the X4 Stellar comes with are pretty floody.
• Emitter, reflector and CRI:
Emitter: This X4 comes with the FFL351A high CRI LED in 5000K, it’s an emitter especially made for FireFlyLite! It’s available in several CCTs, but the main ones available on the X4 Stellar page are 1800K, 2700K, 3700K, 4000K and 5000K. All versions are high CRI (95 CRI). The lower the CCT less lumens it will generate. The SFT25r LED is also available with 4000 lumens.
Lens: It comes with a glass lens double AR coated and it’s advertised to be 98% transmittance.
Reflector/TIR: It comes pre-installed with the 30-degree beaded TIR, and an extra 15-degree beaded TIR is also included on the box. Both options are pretty floody, I think it should have a clear 15-degree option on the box like the X4Q Comet for a more throwy option.
Beam profile: The beam profile with both TIR lens Is very floody and homogeneous, no artifacts or donut holes, nothing. The hotspot is more defined on the 15-degree but still blends very smoothly with the outer spill.
X4 Stellar beam vs X4Q Comet beam:
X4 Stellar
X4Q Comet
CRI: All main FFL351A LED main options offered on the X4 Stellar page are 95 CRI with most of them being above 90 R9.
• Beamshots Camera settings:
- 24mm lens 2" F8 ISO400 WB: daylight (5200K)
It was a little foggy the day I made the beamshoots, sorry for that.
There was some fog on the day I made the beamshoots, sorry for that.
X4 Stellar 5000K - Turbo (2800 luemens) mode
X4 Stellar 5000K - G7 mode
X4 Stellar 5000K - F6 mode
- The trees at the back are around 100m distance, I could measure with more precise tools so now I have a more precise distance.
I always try to match what my eyes can see on the beamshots, so camera settings may vary.
• Driver and UI
Driver: The X4 Stellar comes with the Lume X1 40W constant current “Boost” driver! This driver is very efficient and high power for a tiny flashlight like this. I see no major downsides with the driver and it’s a pretty good driver.
UI: As I mentioned before, this flashlight has the Anduril 2 UI, so you have A LOT of options and customization to make, have fun! It uses a single e-switch to control the entire flashlight and customize to your liking!
Low Voltage Warning: Yes. Both from the battery indicator and the main light will also blink when the battery level is too low.
Reverse Polarity Protection: Yes, the flashlight is protected against reverse polarity, so inserting the battery the wrong way will not fry the flashlight so easily.
Thermal Regulation: The X4 Stellar has active automatic thermal regulation of the Anduril 2 UI, a pretty efficient and safe thermal regulation.
*The thermal regulation can be configured, so be careful to not mess with the thermals.
Lockout: It features electronic lockout on the Anduril 2 UI, by clicking the button 4 times the flashlight will lock and only moonlight will be available for use; and also, mechanical lockout by slightly untwisting the head.
Turbo: The Turbo mode has 2800 lumens on the FFL531A 5000K version of the X4 Stellar, it’s pretty powerful and, of course, produces a lot of heat, especially as it is high CRI, so it doesn’t maintain for too long and the flashlight will become hot fast as expected. Mine lasted 30 seconds until I noticed a stepdown. You can configure the thermal regulation to allow more time on turbo, but be careful as you can reduce the life span of the LEDs and even damage the electronics if you don’t do it correctly.
Moonlight: The moonlight mode on this bad boy is also nearly perfect, constant very low, close to 0.1 lumens output and no flickering or PWM. The FireFlyLite moonlight is currently the best moonlight I have tested so far, so if you like moonlight modes, or “Fireflies” modes like me, this flashlight is perfect for this purpose.
Blinkies: One of the coolest things about Anduril is it´s blinkies modes, I really love that “Candle mode” and the “Lightning”! You can choose from a wide variety of blinkies and even configure their brightness, have fun with it!
A special thanks to Ivy from FireFlyOutdoor for sending this flashlight for me to review!
*I am not being paid to do this review, everything here is my honest opinion.
Thank you for reading my review <3