Olight Arkfeld Ultra Review
Olight Arkfeld Ultra⌗
- Specifications
- Introduction
- Torch in use
- Build quality
- LED, bezel, lens and reflector
- Size and comparison
- User interface
- Batteries and charging
- Performance
- Beamshots
- Conclusion
- Price
- Product page
Specifications⌗
| Brand/model | Olight Arkfeld Ultra |
|---|---|
| LED | Cool White 5700-6700K 70 CRI, green laser, 365nm UV emitter |
| Maximum lumens | 1,400 lm |
| Maximum beam intensity | 2,630 cd |
| Maximum throw | 103 m |
| Battery | Built-in 1500mAh 3.7V LiPo |
| Onboard charging | Yes (magnetic charging) |
| Material | Aluminium |
| Modes | 5 |
| Blinkies | Strobe |
| Reflector | TIR (White Light), OP (UV Light) |
| Waterproof | IPX7 |
| Review date | January 2025 |
Introduction⌗
The Olight Arkfeld Ultra is a flat-style EDC torch with a white emitter, green laser pointer and a 365nm UV light.
It has a magnetic charging port with a built-in 1500mAh 3.7V LiPo battery.
The Olight Arkfeld Ultra is very similar to Olight Arkfeld Pro.
I bought this torch from Olight Australia. I have not been paid for this review nor have I held back my opinions of this torch.
Packaging⌗
The Arkfeld Ultra comes in black box with the Olight logo and Arkfeld Ultra text.
The following was included in the box:
- Olight Arkfeld Ultra.
- Olight MCC-1A Magnetic Charging Cable.
- Olight Arkfeld Ultra Coin.
- User manual.
User manual⌗
Torch in use⌗
The Olight Arkfeld Ultra feels comfortable in my hand.
The deep carry pocket clip makes it nice to EDC.
The torch can tailstand. And the magnetic tail allows it to be mounted like a work light.
Build quality⌗
The quality of the Olight Arkfeld Ultra seems miles ahead of the competition.
I really like the professional look and feel of the button and the selector.
This particular Arkfeld Ultra is made of aluminium and it has a dark blue anodised finish. Olight calls the finish OAL (Olight Aluminium).
There is a lot of grip from knurling on the side of the torch.
The selector clicks into place and the metal button feels nice to press.
LED, bezel, lens and reflector⌗
This Olight Arkfeld Ultra has a cool white (5700-6700K) 70 CRI emitter behind a TIR optic, a 510-530nm 0.39mW (Class 1) green laser pointer and a 365nm UV emitter with an orange-peel reflector.
The white emitter looks like an Osram P9 emitter. It is also available with a neutral white (4000-5000K) 70 CRI emitter.
CCT, CRI, and duv⌗
I have taken Correlated Colour Temperature (CCT) and Colour Rendering Index (CRI, RA of R1-R8) measurements with the torch positioned half a metre away from an Opple Light Master Pro III (G3).
The CCT is around 6143K, the CRI is around 70, and the Delta u, v is positive (green).
The beam produced has a wide spot. It is slightly floody.
| Mode | CCT (K) | CRI (Ra) | x | y | Duv |
|---|---|---|---|---|---|
| Low | 6002 | 70.0 | 0.3215 | 0.3403 | 0.0047 |
| Medium | 6052 | 69.6 | 0.3204 | 0.3399 | 0.0050 |
| High | 6162 | 70.3 | 0.3185 | 0.3362 | 0.0040 |
| Turbo | 6358 | 71.4 | 0.3152 | 0.3308 | 0.0029 |
Calculate Duv from CIE 1931 xy coordinates
Dimensions and size comparison⌗
Dimensions⌗
I took the following measurements using a digital caliper.
| Measurement | Unit (mm) |
|---|---|
| Length | 120.81 |
| Width | 27.66 |
| Height | 23.68 |
Weight⌗
I took the following measurements using a digital scale.
| Weight | Unit (g) |
|---|---|
| Olight Arkfeld Ultra | 120.14 |
Size comparison with its competition⌗
From left to right: Olight Arkfeld Ultra, Wurkkos HD01, Nitecore EDC29
From left to right: Olight Arkfeld Ultra, Wurkkos HD01, Nitecore EDC29
From left to right: Olight Arkfeld Ultra, Wurkkos HD01, Nitecore EDC29
User interface⌗
The Olight Arkfeld Ultra is controlled with a button and a selector.
The selector can be rotated to change between:
- White Light Mode
- Laser Mode
- UV Mode
There are three levels in the main group for White Light Mode:
- Low
- Medium
- High
There are shortcuts to Moonlight, Turbo and Strobe.
There is one blinky mode: Strobe.
White Light Mode⌗
| State | Action | Result |
|---|---|---|
| Any | Press and hold the button for 1 to 2 seconds | Moonlight |
| Off | Click the button | On (mode memory) |
| On | Press and hold the button | Cycle (Low, Medium, High) |
| On | Click the button | Off |
| Any | Double click the button | Strobe |
| Any | Triple click the button | Turbo |
| Off | Press and hold the button for > 2 seconds | Lockout |
| Lockout | Press and hold the button for > 1 second | Unlock |
Laser Mode⌗
| White Light | Laser | Action | Result |
|---|---|---|---|
| Off | Off | Click the button | Laser On |
| Off | On | Double click the button | White Light On (High) |
| On | On | Press and hold the button | Cycle White Light (Low, Medium, High) |
| On | On | Double click the button | White Light Off |
| Any | On | Click the button | Off |
UV Mode⌗
| State | Action | Result |
|---|---|---|
| Off | Click the button | UV Light On |
| On | Click the button | Off |
Swap Turbo and Strobe shortcuts⌗
By default, Turbo is accessed with 3 clicks and Strobe is accessed with 2 clicks.
You can swap them around so that Turbo is accessed with 2 clicks and Strobe is accessed with 3 clicks.
The product pages mentions:
Setting 1 (Factory Mode): Double press for Strobe, triple press for Turbo.
Setting 2: Double press for Turbo, triple press for Strobe.
How to Change: In lockout mode, quickly press the switch ten or more times and hold it on the last press until the white light flashes twice.
Mode memory⌗
Mode memory includes Moonlight, Low, Medium and High. Turbo drops to High.
Timer⌗
A 3 minute or 9 minute timer can be configured to turn the torch off.
When the torch is on, double press and hold.
One blink indicates that a 3 minute timer has been set.
Two blinks indicates that a 9 minute timer has been set.
Strobe⌗
Strobe has a constant frequency.
I measured Strobe with a Zoyi ZT-703S oscilloscope using High Speed mode.
Battery level indicator⌗
There is a battery level indicator below the selector. The indicator will appear when the torch is turned on.
| Colour | Battery level |
|---|---|
| Four green indicators | > 75% |
| Three green indicators | 50 - 75% |
| Two green indicators | 25 - 50% |
| One green indicator | 10 - 25% |
| One red indicator | < 10% |
Low voltage protection⌗
The light turns off when the voltage gets low. I can turn the light back on and the battery level indicator will display one red indicator (< 10%).
Pulse Width Modulation⌗
I did not notice any visible PWM (flickering).
I measured the PWM of the light with a Zoyi ZT-703S oscilloscope.
Moonlight, Low, Medium, High, Turbo
What I like about the UI⌗
- I like how the selector makes it easy to change between the white light, green laser and the UV light.
- Direct access to Moonlight from off.
- Direct access to Turbo from off.
- Direct access to Strobe from off.
- The shortcuts for Turbo and Strobe can be swapped.
What could be improved⌗
- I personally would prefer it if the shortcut for lockout mode is four clicks instead of pressing and holding from off for 2 seconds.
Batteries and charging⌗
Battery⌗
The Olight Arkfeld Ultra has a built-in 1500mAh 3.7V LiPo battery.
Charging⌗
The Olight Arkfeld Ultra has magnetic charging.
The magnetic charging cable has an input of 5V 1A and an output of 4.2V 1A.
Power supply: PinePower Desktop USB-C
USB Meter: ChargerLAB Power-Z KM003C
Room temperature: 21 C
It took about 2 hours 27 minutes to charge the torch at a rate of 5V/0.85A.
The indicator light in the magnetic charging cable changes from red to green when charging is complete.
Power supply compatibility⌗
I tried the following power supplies with the USB-A magnetic charging cable:
| Power supply | USB Type | Protocol | Does it charge? |
|---|---|---|---|
| PinePower Desktop | USB-A | QC | Yes |
| PinePower Desktop | USB-A | Yes |
Performance⌗
Specifications from the manual:
White Light⌗
| Lumen | Runtime | Throw | Candela | |
|---|---|---|---|---|
| Turbo | 1,400 + 420lm | 4 + 121min | 103m | 2,630cd |
| High | 420 + 100lm | 135 + 12min | 62m | 971cd |
| Medium | 100lm | 9h45min | 29m | 210cd |
| Low | 15lm | 55h | 11m | 31cd |
| Moonlight | 1lm | 11days | 2m | 1cd |
UV Light⌗
Optical Power: 900+560mW
Wavelength: 365nm
Runtime: 5+310min
The user manual has a bit of a runtime graph with the estimated output over time.
Lumen measurements⌗
| Mode | Specs | Lumens @turn on | Lumens @30 sec | Lumens @10 min |
|---|---|---|---|---|
| Moonlight | 1 | |||
| Low | 15 | 14 | 14 | 14 |
| Medium | 100 | 95 | 93 | 92 |
| High | 420 + 100 | 378 | 371 | 361 |
| Turbo | 1,400 + 420 | 1,315 | 1,243 | 364 |
Moonlight was too low for my DIY lumen tube to detect.
Runtime graphs⌗
I used my own DIY lumen tube with a TSL2591 sensor and forked bmengineer’s project RuTiTe to record runtimes.
Note: Lumen measurements may be off by 10% with my DIY lumen tube.
The room temperature was approximately 21 C.
Runtime⌗
Here is a summary of the runtime results:
| Mode | User manual | Runtime | Turn off |
|---|---|---|---|
| Turbo | 4 + 121min | 2h 10min 56s | 2h 21min 28s |
| High | 135 + 12min | 2h 29min 9s | 2h 29min 9s |
| Medium | 9h45min | 10h 11min 24s | 10h 11min 24s |
| Low | 55h | 10min+ | 10min+ |
| Moonlight | 11days | 10min+ | 10min+ |
“Runtime” is the time until the output reduces to 10% of the output at 30 seconds (as per the ANSI/PLATO FL1 2019 Standard).
“Turn off” is the time until my DIY lumen tube no longer detects more than 1 lumen.
“+” indicates that the light remained on after recording had stopped.
The runtime is good, as expected.
The output looks well regulated.
Throw⌗
I took lux measurements with a UNI-T UT383BT at 30 seconds. Each mode was measured at one metre.
| Mode | Specs (cd) | Specs (m) | Candela measured (cd) | Distance (m) |
|---|---|---|---|---|
| Moonlight | 1 | 2 | 0 | 0 |
| Low | 31 | 11 | 32 | 11 |
| Medium | 210 | 29 | 232 | 30 |
| High | 971 | 62 | 919 | 60 |
| Turbo | 2,630 | 103 | 3,157 | 112 |
Beamshots⌗
I went to a local park and aimed the Olight Arkfeld Ultra at a tree 70 metres away while using Turbo.
Beamshots were taken using a Sony RX100M2 using 3.2", f3.2, ISO 100, 5000K WB.
Olight Arkfeld Ultra (Turbo)⌗
Olight Arkfeld Pro (Turbo)⌗
Wurkkos HD01 Spot (Turbo)⌗
Nitecore EDC29 (LUMIN SHIELD)⌗
Nitecore EDC29 (SEARCH)⌗
Here is a video demonstrating the Olight Arkfeld Ultra near a creek:
Conclusion⌗
The Olight Arkfeld Ultra is now my top pick for a flat-style EDC torch to take along to work sites for inspections.
The button and selector make this torch simple to use.
The quality of the Arkfeld Ultra feels like it is miles ahead of the competition.
It would be nice if the UV light had a ZWB2 filter to increase the contrast so that colours appear more vibrant.
A user replaceable battery would come in handy if the battery degrades over time.
The output is well regulated and the runtimes are good.
I bought the Olight Arkfeld Ultra after testing my brother’s Olight Arkfeld Pro.
It is a hard choice between this and the Olight Arkfeld Pro. They are almost the same.
Let me know if you would like me to review more EDC torches by Olight. :-)
Pros:⌗
- Excellent build quality.
- Excellent runtimes.
- Good beam distance.
- Floody beam.
Cons:⌗
- Low CRI (70) for an EDC torch.
- No ZWB2 filter for the UV light.
- Built-in battery.
Price⌗
The Olight Arkfeld Ultra is AU$179.95 from olightstore.com.au
Product page⌗
Here is a 10% promo code that may be used when there isn’t a sale: TMM10
Olight Arkfeld Ultra at olightstore.com.au (affiliate link)
I may earn a commission if you use an affiliate link or a promo code. This will help fund future torch reviews and tutorials.