Olight Seeker 4 Mini

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Olight Seeker 4 Mini specs

Brand & Model	Olight Seeker 4 Mini
Flashlight category	EDC / hunting
LED	N/A (white + 365nm UV)
Max. output	1200 lumens
Max. beam distance	120 meters
Max. beam intensity	3,600 cd
Battery config.	1x 18350 (proprietary)
Onboard charging	Yes, proprietary (MCC)
Main modes	5
Blinkies	Strobe
Waterproof	IPX8
Review publication date	June 2023

Olight has a pretty broad selection of lights. They make some great keychain lights such as the i3E EOS and the i1R 2 Pro. Olight also has EDC lights like the Baton series. But that’s not all… gun lights, tactical lights, high-power lights, general lamps/lanterns, and now branching out into things like knives and pens. For the most part, if it needs to be lit up, Olight has you covered. One of the things I love most about Olight is their attention to detail. Quality is generally fantastic, anodizing and machining are great… they just know how to make a solid product.

This particular model – the Olight Seeker 4 Mini – is a new model in the lineup. While Olight has made Seeker models (multi-emitter, high lumens), I believe this is the first mini Seeker.  It’s a decently portable EDC flashlight with an interesting design. This is a triple LED light, but only two of those are white LEDs.  The third is a UV LED.

The Seeker 4 Mini comes with the battery isolated with a protection tab, so you’ll need to unscrew the tail cap to remove that.  Once that’s out of the way, you’re set!

Package quality.

Some Olights come in fantastic heavy-duty two-part nested containers with splashy images of the light inside and meticulously arranged contents. Other lights, like some of the more EDC models, come in nice, but not overdone, packaging that feel like less of a presentation case and more of an actual carton to be recycled. The Seeker 4 Mini came in one of the latter packages. It’s nice, clean, and gets the point across without investing too much in the box. Sliding out the inner, formed plastic tray reveals:

• Olight Seeker 4 Mini
• 18350 battery (ORB-183C11)
• MCC 1A charging cable
• Lanyard
• Manual

With the Olight Seeker 4 featuring both white and UV LEDs, my mind naturally gravitates to another recent Olight that used a similar configuration: the Arkfeld UV. Feature-wise, these lights are very similar. Lumen outputs are relatively close and they both feature a 365nm UV LED. And while they’re both small-ish, the form factors are very different. The Arkfeld UV is very flat, much like modern TV remote control. The Seeker 4 Mini, however, is much more reminiscent of a typical flashlight. It’s cylindrical with a removable battery and a single e-switch for control (whereas the Arkfeld also had a selector ring). The size is relatively small, but a bit thick around the head in order to make room for the 3 LEDs.

There’s a pocket clip that is very firmly attached, and comes that way from the factory. You could remove it if you really wanted to. The clip features a 2-way design, and is definitely not deep-carry.  The overall clip style isn’t my favorite. Even if it’s not deep-carry (which would have been nice), it seems like the 2-way isn’t necessary unless you’re really dedicated to heads-down carry – and that would be a bit bulky because of the head thickness.

Like many Olight models, the tail is magnetic. That makes it easy to securely position it on all kinds of metal surfaces: car hoods, workbenches, appliances, etc. The tail is also completely flat, so it tail-stands well.

The metal switch is a nice accent color: black on my OD Green model as well as the red version, and blue on the black-bodied one. The switch sits a bit proud of the head of the flashlight. This makes it very easy to locate and activate, but it could be problematic if you want to carry the Seeker 4 Mini in your pocket without locking it first. Thankfully, locking the light is pretty quick and easy (just a ~2 second hold from Off).

If you don’t mind the thickness of the head, the Seeker 4 Mini is an EDC kinda light. Having 1200 lumens of moderately floody light is good for things like around the house/office, out for a walk, camping, hiking, etc. Oh, and that UV light? It’s actually 365nm which is awesome for a lot of detection scenarios: currency validation, stain detection, etc..

Olight’s warranty:

At Olight, we always care about your experience as a customer and want to ensure you have no concerns regarding after-sales service. On September 16th, 2023, we sincerely make the following important promise:

If you purchased an Olight® product from Australia, China, France, Germany or the USA after January 1st, 2023, the local service centers in these countries will honor your LIFETIME WARRANTY for your purchase. If your Olight® product (including its structure, built-in battery, LED, or lens) ever experiences any issues, we promise to take care of it. If we are unable to repair your product, we will promptly replace it with a product in perfect working condition, which will be of equal or better physical condition. If your purchase is a limited or discontinued edition of Olight® product, we will repair or replace it with another Olight® product of the same or higher value.

Olight recently made a pledge to the community to listen to customer feedback. And I think offering CCT options is one of the key ways that Olight is proving this out. The Seeker 4 Mini is offered in both Cool White (5700-6700K) and Neutral White (4000K-5000K) options. Well, for the Black and OD Green models – the red verison is CW-only. The LED version is clearly labeled on the head of the flashlight above the clip. Olight kindly sent along the requested NW version. They haven’t disclosed what model the LED is, but if I had to guess I’d say maybe it’s an OSRAM P9 or something along those lines. Two of the three emitters are this white LED.

The remaining LED is a 365nm UV LED. Again, Olight hasn’t disclosed what the exact LED is, but they did mention that it’s producing 760mW of optical power (consuming 2.4W of electrical power). There is no bandpass filter, so you do get some stray white light. That said, the 365nm did an excellent job getting currency security strips to fluoresce, as well as other things around the house like paint imperfections, unseen spills, etc.

Each LED is nicely centered in its own reflector well. The reflector is smooth and appears to be covered with AR-treated glass. The arrangement is held in place with a very wavy bezel of the same accent color as the button.

Measurements from my Opple Light Master at 3 meters on the Turbo:

• CCT: 4978K
• CRI: 67.6 Ra
• DUV: +0.0053

Dimensions: 

Olight Seeker 4 Mini	Millimeters	Inches
Length	87 mm	3.4 in
Head diameter	30 mm	1.2 in
Body diameter	24 mm	0.9 in

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

Weight: 

Olight Seeker 4 Mini	Weight in grams	Weight in oz
Without battery:	84 g	3.0 oz
With battery	110 g	3.9 oz

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

Flashlight size comparison with its competition:

Group 1: Olight Arkfeld UV, Olight Seeker 4 Mini

Group 2: Sofirn SC21 Pro, Olight Seeker 4 Mini, Acebeam Pokelit AA, Reylight TI LAN

The UI is pretty standard stuff and easy to get the hang of if you’ve spent any amount of time with an e-switch light. There’s an extra action for the UV light, but otherwise it’s pretty standard Olight-UI stuff. 

Available modes: 

• Moonlight, Low, Medium, High, Turbo, UV

Available blinky modes:

• Strobe

From OFF:

• Press and Hold 1 second: Moon
• Press and Hold 2+ seconds: Lockout
• Single click: turn On
• Double click: UV 
• 3 clicks: Strobe

From ON:

• Press and Hold: change modes (Low > Med > High)
• 1 click: turn Off
• Double click: Turbo
• Double click + hold (press & release, press & hold): activate timer
• 3 clicks: Strobe

Mode memory:

• Yes, there is mode memory

Shortcuts:

• To Moonlight: press and hold 1 second from Off
• To Turbo: double click from On
• To UV: double click from Off
• To Strobe: triple click (from Off or On)

Low voltage warning/protection:

• There in the middle of the button that display the battery level:
  • Green: >= 60%
  • Orange: 10-60%
  • Red: 5-10%
  • Blink Red: <5%
• In Moonlight mode, the only warning indicator you get is Blink Red at <5%

Strobe/blinkies

• There is a strobe mode that can be activated with a triple click from Off or On

Lock-out mode: 

• Electronic lockout mode is enabled by holding the button down for 2+ seconds while the light is off 

PWM

• There is no PWM present

Additional/summary info on the UI: 

• There’s only one UV level, and accessing it is just a double-click from Off. On many Olight’s, this is another shortcut to Turbo. 
• There is also a neat Timer mode, as seen on other Olights.
  • With the light on and in your desired mode, do a double click + hold (press & release, press & hold) until you see a blink. 
  • One blink means that you activated a 3 minute timer. 
  • Two blinks means that you activated a 9 minute timer.
  • To switch between the 3 minute and 9 minute timers, after you’ve activated the timer, do another double click + hold.
  • Your timer preference (3 minutes versus 9 minutes) will be memorized for next time.

The Olight Seeker 4 Mini uses an Olight-proprietary 18350 battery. The ORB-183C11 that it came with has a negative-polarity ring surrounding the positive button. While it is proprietary, at least it is replaceable (looking at you, Arkfeld). Olight says that the capacity of the battery is 3.96 Wh (1100 mAh / 3.7 V).

They also say the charge rate using the supplied MCC (magnetic charging cable) is 1 amp and a charge cycle should take around 1 1/2 hours. My tests showed that to hold true, observing a charge rate of 4.52 watts (0.89 amps at 5.09 volts) and taking 1 hour and 37 minutes to complete the charge cycle.

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. Due to the design of the battery, current tests were not possible.

Mode	Specified	turn on	30 sec	10 minutes
Moonlight	2 lm	1.2 lm	1.2 lm
Low	15 lm	14 lm	14 lm
Med	120 lm	96 lm	94 lm	93 lm
High	600 > 120 lm	596 lm	594 lm	589 lm
Turbo	1200 > 600 > 120 lm	1152 lm	1146 lm	590 lm

Parasitic drain:

• N/A – could not measure due to battery design 

The lumen measurement tests came out pretty much spot-on with Olight’s claims. It’s great to see a ~1 lumen mode in a smaller flashlight like this one.

Olight Seeker 4 Mini 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	Measured runtime ANSI	Time till shut off
Moonlight	12 days	–	–
Low	33.5h	–	–
Med	5h 20min	5h 27min	5h 27min
High	50+25min	1h 23min	1h 23min
Turbo	3+41+25min	49min	1h 17min

Just like in the lumen output tests, there’s no surprises here. My measurements were very well aligned with the manufacturer claims.

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. Candela values for Low was measured at 2 meters. A UNI-T UT383 BT lux meter was used.

Mode	Specified	Candela measured	Meters	Yards
Moonlight	4 cd
Low	49 cd	56	15 m	16 yd
Medium	370 cd	400	40 m	44 yd
High	1,824 cd	1,825	85 m	93 yd
Turbo	3,600 cd	3,550 cd	119 m	130 yd

Camera settings and distance: 

Beam shots of the building are taken at 30 m (33 yd) using a Pixel 7 set to ISO 800 with 1/10 second exposure time

Beamshots of the following flashlights compared:

• Olight Seeker 4 Mini
• Olight Arkfeld UV
• Olight Baton 3 Pro Max

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