Imalent released the UT90 Predator flashlight, a beast of a light which utilizes the Luminus SBT-90.2 emitter.  The UT90 has a built in battery (with on-board proprietary magnetic charging), a couple of screw in lens filters, and includes mounting hardware for weapon mount.  It’s a beast of a light!

Official Specs and Features

Here’s a link to the official product page.


I believe there is just one version.


The going price for the Imalent UT90 Predator Flashlight is $209.90 at Imalent store.

Short Review

This is an extremely fun implementation of the Luminus SBT-90.2 emitter.  It feels like “wielding” a flashlight, which I can’t always say.  The slim handle, and in-series cells (2) make this one noteworthy.  Charging is good, though I wish it was the same as the other Imalent charge ports.  The jump from low to medium is much too big; a 5th mode should be added to the light, between low and medium.  The filters are nice and very high quality.

Long Review

The Big Table

Imalent UT90 Predator Flashlight
Emitter: Luminus SBT-90.2
Price in USD at publication time: $209.90
Cell: 2×21700
Turbo Runtime Graph High Runtime Graph
LVP? Yes
Switch Type: E-Switch
Quiescent Current (mA): ?
On-Board Charging? Yes
Charge Port Type: Proprietary Magnetic
Charge Graph
Power off Charge Port
Claimed Lumens (lm) 4800
Measured Lumens (at 30s) 3872 (80.7% of claim)*
Candela per Lumen 79.8
Claimed Throw (m) 1308
Candela (Calculated) in cd (at 30s) 8360lux @ 6.07m = 308023cd
Throw (Calculated) (m) 1110.0 (84.9% of claim)*
All my Imalent 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

  • Imalent UT90 Predator Flashlight
  • Weapon mount
  • Lenses (2, red and green)
  • Charge cable (USB to proprietary magnetic)
  • Weapon remote switch (proprietary magnetic to cord)
  • Spare o-rings (2)
  • Manual

Package and Manual

imalent ut90 box top

imalent ut90 manual

Build Quality and Disassembly

imalent ut90 feature photo

imalent ut90 emitter

imalent ut90 tail switch

imalent ut90 tailstanding

imalent ut90 tailcap

I didn’t find that the tailcap can be removed.  I expect with enough interest, it’s possible.  But you might find that special tools are required.

imalent ut90 body

imalent ut90 body

There are minimal depth cooling fins in two places on the head.

imalent ut90 head and cooling fins

imalent ut90 bezel

The bezel isn’t flush on a surface, so light can escape from here.

imalent ut90 bezel

imalent ut90 bezel with light on

imalent ut90 side e-switch

imalent ut90 side e-switch profile

imalent ut90 indicator

imalent ut90 cooling fin detail

imalent ut90

imalent ut90 reflector

No tailstanding is possible while the charge cable is attached.  The cord comes straight out of the back of this connector.

imalent ut90 charge cap attached

imalent ut90 bezel threads

The light does come apart.  The head comes off the body.  The threads here are very smooth, square cut, moderately long, and anodized.

imalent ut90 battery handle removed

The head end has a big beefy spring for contact.  I think there’s more going on here than you might initially suspect – more on that in the charging section.

imalent ut90 positive contact spring

imalent ut90 head off of body

The bezel is removable, but there’s actually no point – the red and green filters screw on over this bezel.

imalent ut90 bezel removed (unnecessary)

The light has an indicator!  More on that in the power section, but note here that this is not also a switch.  It’s only an indicator!

imalent ut90 indicator on

imalent ut90 e-switch on side

imalent ut90

imalent ut90 tailcap

imalent ut90 on

The tailcap is keyed, which is important.  The charge cable and pressure switch will only connect to the light in one orientation.

imalent ut90 keyed tailcap

The magnet is strong enough to hold the connector on incorrectly but charging won’t happen this way.  So be sure you get it seated properly.

imalent ut90 keyed tailcap

Size and Comps

I think Imalent has some numbers in the wrong place on their site, but here are the measurements.

Measurements: 66mm (head diameter) x 25.4mm (body diameter) x 245.5mm (length)

Weight: 418g (battery included)

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.

Retention and Carry

I believe this is primarily considered a weapon light, and that’s cool and fine.  (But I can also state unequivocally that the UT90 would be fun for just general out of doors flashlighting, without being mounted to a weapon.)

As it’s a weapon light, it includes some mounts.  That’s a bit unusual.  The mount included is named the “X-UL01” but I don’t believe it’s available independently of the light.

imalent ut90 weapon mount

The mount is tall enough that the rails clear just fine.

imalent ut90 weapon mount

I don’t know just a whole lot about mounting a light like this on a gun that it’d be suited for, but I hope these attachment photos will help.

The thumbscrew is captured, so you don’t really have to worry about losing it.  Also the slot on the screw is very wide, and I was able to find something at-hand to open it when I needed to (actually it was the pocket clip of my Convoy S2+ seen above).  Coins would work well, too.

There’s no belt clip, or pouch for carry, or anything else.  The weapon mount is it.

Power and Runtime

Included with the purchase and required for use of the UT90 Predator is the battery pack seen on the right below.  This is a 21700×2 series setup, so the light is running at 8.4V fully charged.

imalent ut90 body off head

I don’t see a way to remove these 21700 cells, so that’s a bit of a downfall.  I can also say that I don’t even see a seam on the tailcap.  Maybe the last mm or so where the “keyed” area is could be removed with a very special tool, but by and large you should consider this battery “permanently affixed” inside.

Output is good, and as you’d expect.  I have this one marked as terminating at “0V” but I’m going to rerun this test – I think I might have put my dmm on the wrong terminals (it was the first test I ran).  The other test do show low voltage protection, which kicks in at around 2.9V per cell (5.9V for the series system.)

There’s a big stepdown off the turbo output, which again, you pretty much expect.  At 4000 lumens or whatever, heat will become an issue very quickly!  Stepdowns are one way to manage that.

imalent ut90 runtime graph turbo

The stepdown on High is pretty dramatic too – and to around the same level as the stepdown from Turbo.  High fortunately lasts a bit longer than Turbo, and is still a massive >3200 lumens.  Would you notice the difference between High and Turbo?  Honestly probably not (mathematically speaking).  If you watch the switch from High to Turbo, sure you will notice the light getting brighter.  But if you have the light on High, close your eyes and switch to Turbo, you’ll almost certainly not notice this difference.

imalent ut90 runtime graph high

The output on Medium fades downward with the battery voltage.  I’d much prefer better regulation here, but this isn’t that bad.  Output is still a whopping 1512 lumens, and at turn off around 500.  This is quite bright indeed.

imalent ut90 runtime graph medium

On bench power, at 8.4V (same as the 21700×2 in series setup), the indicating LED turned from green to red at 6.3V.  Then began flashing red at 5.9V, and finally the light shut off completely at 5.4V.  This is 2.7V per cell, which is acceptable.


The Imalent UT90 Predator flashlight package includes the requisite charge cable.  This one is USB to proprietary magnetic, and not the same proprietary magnetic that the other newer Imalents use.

I find that to be a bit unfortunate, but I suppose it has to do with the remote switch also using this same contact area.  The magnet connector is keyed, and while it’ll attach any which way, it’ll only work in one way.  When seated, it’s very well seated.

imalent ut90 charge connector attached

Due to the cord coming straight out of the magnet cap, the connector can not be used as a “charge base.”

imalent ut90 charge connector attached

imalent ut90 charge connector keyed

Charging looks very good, at around 1.8A.  One thing I mentioned above about the contacts in the head.  Well a few more.  First off, the head must be connected to the body for charging.  This is a little bit of a disappointment, since it means you won’t be able to charge backup batteries and still use your light.  But probably not the biggest issue, since, … who’s really doing that.

Since the USB voltage has to be boosted from 5V to around 8.4V for charging, I think the head must be involved in this.  This also means that while the charge connector is doing 5V/1.8A (or 9W), the battery is seeing 9W in a different way – 8.4V (ish) and around 1A.  1A is perfectly acceptable for this battery.  A good upgrade would be to make the USB end USB-C, and support power delivery.  Then you could deliver more current, and charge the battery at 1.5 or even 2A.

imalent ut90 charge graph

Modes and Currents

Mode Mode Claimed Output (lm) Claimed Runtime Measured Lumens Tailcap Amps
Turbo 4800/1500 1m/105m 3872 11.92
High 3000/1500 1m/115m 3216 7.11
Middle 1500 2h5m 1512 2.35
Low 30 100h 15 0.03

Pulse Width Modulation

The lower modes do have pulse width modulation, but it’s very fast.  I did not notice it during use.

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

The Imalent UT90 Predator flashlight has two switches.  First let’s look at the tailswitch.  It’s a button right in the center, and surrounded by two contact points.  This is an e-switch with very low travel, and a quiet (but not soft) click.  This switch is not the most proud part of the tailcap.  (That would be the keyed parts.)

imalent ut90 tailcap switch

The second switch is the e-switch on the side of the head.  The switch cover, and the switch are exactly the same as on the tailcap, but the side switch is the most proud part on that side.

Also on the head end, but not a switch is this battery indicator.  It looks and feels very much like the other switches, but has deeper texture.

imalent ut90 indicator (not a switch)

Finally, there’s this remote switch.  This switch attaches exactly like the magnetic charge connector.  They can not be used concurrently.  This connector is also keyed, and will work in only one orientation.  I am unable to test if the magnet is strong enough to withstand recoil, but I can say that the connection is very secure.  I would rather this have a quarter turn screw down connection, or something like that, though.

Here’s a UI table!

State Action Result
Off Click Side or Tail switch On (Mode Memory)
Any Hold Tail switch Turbo (Momentary)
Any Double click Side or Tail switch Turbo (steady)
On Hold Tail Switch Turbo (Momentary) (previous mode on release)
On Hold Side Switch Mode Cycle (LMHT direction)
On Click Side or Tail Switch Off
Any Triple click Side or Tail Switch Low
Off Click Remote Switch On (Mode Memory)
Any Hold Remote Switch Turbo (Momentary) (previous state on release)

LED and Beam

Imalent chose a Luminus SBT-90.2 for the UT90.  This is a high output, good throw emitter.

imalent ut90 emitter while on weapon mount

This emitter is coupled with a deep, wide, and very lightly textured reflector.

imalent ut90 emitter

imalent ut90 beamshot

imalent ut90 reflector low

There are also included a couple of screw in lens covers, for red and green output.

imalent ut90 green lens filter

imalent ut90 lens filter installed

imalent ut90 lens filter

imalent ut90 lens filter installed red

imalent ut90 lens low

These beamshots are always with the following settings:  f8, ISO100, 0.3s shutter, and manual 5000K exposure.  Note from these beamshots how high the output jumps from Low to medium!

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

Test light is on the left!

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


What I like

  • Great build quality
  • Luminus SBT-90.2 really shines in this application
  • User interface is fairly good, and the switches are nice
  • Good inclusion of all the parts needed for weapon mount

What I don’t like

  • Gap from Low to Medium is too wide
  • Not possible to swap the cells
  • Battery pack can’t be charged off the head


  • This light was provided by Imalent for review. I was not paid to write this review.
  • This content originally appeared at  Please visit there for the best experience!
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1 thought on “Imalent UT90 Predator Flashlight Review”

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