The Seeknite SK03 titanium flashlight was a light that hit Banggood not too long ago.  I think it’s been around a while under other names, but I got in at the preorder price and couldn’t say no.  So here’s a Fun Fund Friday review of it!

Official Specs and Features of the Seeknite SK03 Titanium flashlight

Here’s a link to the sales product page.  That’s an affiliate link


There are versions: Silver and Sandstone (seen here.)


I paid around $13 for this light in the preorder, but I think it’s around $25 now.

Short Review of the Seeknite SK03 Titanium flashlight

I love the host of this light.  I don’t love the emitter, and unfortunately it’ll take tier-2 level skill to swap it.  I like that it’s a single mode light.  Overall honestly it’s fantastic except for the 6500K emitter.  It lacks some things that it should have – namely o-rings, however.

Seeknite SK03 Titanium flashlight Long Review

The Big Table

Seeknite SK03
Emitter: Cree XM-L2 (6500K-7000K)
Price in USD at publication time: $24.69 on banggood (affiliate link)
Cell: 1xAAA
Turbo Runtime High Runtime
Switch Type: Mechanical
On-Board Charging? No
Claimed Lumens (lm)
Measured Lumens (at 30s) 37
Candela per Lumen 9.1
Claimed Throw (m) 50
Candela (Calculated) in cd (at 30s) 48lux @ 2.643m = 335cd
Throw (Calculated) (m) 36.6 (73.2% of claim)*
All my Seeknite reviews!
  • Measurement disclaimer:  I am an amateur flashlight reviewer.  I don’t have $10,000 or even $1,000 worth of testing equipment.  I test output and such in PVC tubes!!  Please consider claims within 10% of what I measure to be perfectly reasonable (accurate, even).

What’s Included

Seeknite SK03 what's included

  • Seeknite SK03 Titanium flashlight
  • Plastic carry case

Package and Manual

There is no manual.

Build Quality and Disassembly

Seeknite SK03 feature photo

I opted for the “Sandstone” version, and I’m extremely pleased that I did.  The finish is just wonderful – probably the highest quality aspect of the whole light.

Seeknite SK03 emitter

Seeknite SK03 switch

Some have wondered if this is actually titanium.  I mean for $13 (preorder) or even $25, that’s a perfectly reasonable question!  I can say with enthusiast-level certainty that this is definitely titanium.

Seeknite SK03 standing, pocket clip

If you have titanium lights, you know how I know this.  It’s the threads.  The threads on titanium lights are almost never as-smooth-as-you-want-them-to-be-for-what-you-paid.  But in this case, for what you paid, the threads are probably appropriately smooth.  Anyway more on that later.  Suffice to say:  this is titanium.  (It even tastes like titanium.)

Seeknite SK03 standing, pocket clip detail

The tailcap has a little bit of knurling, and to my eye this knurling isn’t on the right axis with the body.  While that bothers me more than it should, the knurling itself is actually very well executed, and functional.

Seeknite SK03 knurling on tailcap

The head is completely smooth.  In fact the body is mostly, too.  The head doesn’t have any reliefs to allow light out when headstanding.  Some flutes would be very neat!

Seeknite SK03 smooth bezel

Seeknite SK03 friction fit pocket clip and knurling

Seeknite SK03 body detail

The body has a nice slim profile, and the tapers outward for the head and tail.

Seeknite SK03 head detail

Seeknite SK03 laying on side

Here’s some more detail on the threads.  They’re square cut, not very long, and I don’t believe lubed at all.  You can also see here one of the few places with an o-ring.

Seeknite SK03 head off showing threads

The head guts are held in place by a brass retaining ring.  This unscrews easily.

Seeknite SK03 head off showing guts

The tailcap comes off in the same way.  The body is not the same on either end, so the cell tube is not reversible.

Seeknite SK03 head and tail removed

The tailcap (right) also has a brass retaining ring, which also is easily removed.

Seeknite SK03 internals of head and tail

Seeknite SK03 disassembled

Seeknite SK03 with aaa installed, open

Here’s a little on-bench detail of the parts.

Seeknite SK03 head complete disassembly

You can see the mcpcb below – the driver and emitter and battery contacts are all one board.

Seeknite SK03 two sided mcpcb emitter side

If you are able to reflow emitters with a hot air station, then you can probably do a swap on this.  But if you have no hot air, it’ll be much harder.  See below, the bottom of the board.  It’s full of components, not the least of which is a big brass barrel for connecting the positive of the cell.

Seeknite SK03 two sided mcpcb cell side

The optic is exposed on the front of the light.  Also, there’s no o-ring.  So the front of the optic (at right below) presses against the titanium body.  I wouldn’t call that water proof at all.

Seeknite SK03 optic

Just a quick “further proof” that this is titanium – when removing the pocket clip, I scarred the body in a “very titanium” way.

Seeknite SK03 titanium marks from clip

Here are the guts from the tailcap.  That’s a reverse clicky switch.

Seeknite SK03 tail cap disassembled

The tailcap has a nice big spring.

Seeknite SK03 switch and cap

Seeknite SK03 switch and cap

Size and Comps

Officially 75mm long, 17mm diameter in the head, and 15mm diameter in the tail.

If a light will headstand, I’ll show it here (usually the third photo).  If a light will tailstand, I’ll show that here, too (usually the fourth photo).

Here’s the test light with the venerable Convoy S2+.  Mine’s a custom “baked” edition Nichia 219b triple.  A very nice 18650 light.

And here’s the light beside my custom engraved TorchLAB BOSS 35, an 18350 light.  I reviewed the aluminum version of that light in both 35 and 70 format.

Seeknite SK03 beside torchlab boss 35

Retention and Carry

A pocket clip is included and installed from the factory.  I believe this clip to also be titanium.  It has the same finish as the body.

The friction fit pocket clip fits only on the tail end of the light, and can’t be flipped.  As such, this light won’t do as a hat light.  Really too bad, it could have been perfect in that role!  But I’d rather have no hat light capability than change the body in such a way that the pocket clip could go either way.

Nothing else is included for carry.  I wouldn’t call the plastic box a carry case!

Power and Runtime

The Seeknite SK03 titanium flashlight is powered by a single AAA sized cell.  It will only work with 1.5V cells – so alkaline, NiMH, or lithium (but not lithium ion) cells.  I tested exclusively with a NiMH Eneloop AAA cell.  This cell works well in the light.

Seeknite SK03 cell installed

The cell goes into the light in the usual way:  Positive toward the head.  Below I’ve shown removing the head for cell installation, but it’s equally right to install the cell through the tail end.  I don’t like twisting the body against the clip, though.

Seeknite SK03 cell installed

The light has just one mode, and here’s the runtime on that mode.  I believe the claim is 4 hours, and while the Banggood comments saying the lumen output is “350 lumens” that’s obviously and definitely not the case.  It’s not advertised as that, though.  Just a wrong answer to a question on the sales page.  But be aware.

Seeknite SK03 runtime graph

Modes and Currents

Mode Mode Claimed Output (lm) Claimed Runtime Measured Lumens Tailcap Amps
On 37 1.04*

Pulse Width Modulation

There isn’t any pulse width modulation on the one mode!

Seeknite SK03 pwm graph

For reference, here’s a baseline shot, with all the room lights off and almost nothing hitting the sensor.  And here’s the worst PWM light I have ever owned.  Also one of the very first lights I ordered directly from China!

User Interface and Operation

There’s a single switch on the SK03.  It’s a reverse clicky.

Seeknite SK03 reverse clicky switch

The clicky has a metal cover, and is very proud.

Seeknite SK03 reverse clicky switch profile

There’s quite a long action on the switch.  It’s really a very pleasant switch to click.  That said, the switch cover (the metal bit) has a good bit of wobble over the top of the plastic switch on the inside.

Seeknite SK03 reverse clicky switch removed

Here’s a UI table!

State Action Result
Off Click On
On Click Off
Off Quadruple half click World Peace*
  • Just kidding, quad half click doesn’t do anything.

LED and Beam

The emitter of choice on the Seeknite SK03 titanium flashlight is a Cree XM-L2.  That emitter is under a spot version of an optic.

Seeknite SK03 emitter and optic

I wouldn’t pick Cree XM-L2, and certainly not this cool white one at 6500K-7000K.  I do like the TIR though, but this one seems to not sit over the emitter just right, so the beam has some artifacts.

Seeknite SK03 on in hand

Like I said about swapping the emitter: I wish, but you’ll need hot-air-reflow skills to do so.

Seeknite SK03 mcpcb emitter side

Seeknite SK03 optic

These beamshots are always with the following settings:  f8, ISO100, 0.3s shutter, and manual 5000K exposure.  You can see the artifacts in the beam clearly below.

Seeknite SK03 beamshot ceiling

Tint vs BLF-348 ( 219b version) (affiliate link)

Test light is on the left!

Seeknite SK03 beamshot door

I compare everything to the 219b BLF-348, because it’s inexpensive and has the best tint!


What I like

  • Inexpensive titanium host
  • Simple UI
  • No PWM
  • Spot optic
  • Very good pocket clip

What I don’t like

  • Cool white outdated emitter
  • Beam profile not very smooth

Ultimately I’m not sure this is a good host, which is mainly why I bought it.  The lack of o-rings is one part, but the single mcpcb is the other.  I don’t know of any good drivers like this, and ultimately I question the waterproofness.


  • This light was provided by me for review. I was not paid to write this review.
  • This content originally appeared at  Please visit there for the best experience!
  • For flashlight related patches, stickers, and gear, head over to PhotonPhreaks, another site where I write!
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1 thought on “Seeknite SK03 Titanium Flashlight Review”

  1. Question for anyone out there:
    How would you swap the emitter?

    I’m thinking build a little shield around the led and apply hot air down on the mcpcb, but not directly onto the components flanking the led. Maybe the led side will heat up before the back side? If the solder holding the driver components on the opposite side were to also liquify, do you think they would fall off or stay in place?

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