Imalent RT90 Luminus SBT-90.2 Flashlight Review

Imalent just released the RT90 Luminus SBT-90.2 flashlight, and it’s quite a little beast!  It sports a “can sized” body, a very throwy emitter, and good performance.  Read on for some testing and thoughts!


Official Specs and Features of the Imalent RT90 Luminus SBT-90.2 flashlight

Here’s a link to the official product page.

Versions

There is just one version of the Imalent RT90 Luminus SBT-90.2 flashlight

Price

These are listed at $149.95, and as they’re very new, that’s probably about what you can expect to pay.


Imalent RT90 Luminus SBT-90.2 Flashlight Short Review

This is a fun light.  While can lights aren’t necessarily lights that I chase, or buy often, this is an unusual interesting one.  It’s small.  But it has a deep smooth reflector, and has ridiculous throw for a can light.  Performance is good (aside from missing the 4800 lumen claim at 30 seconds).

Long Review

The Big Table

Imalent RT90
Emitter: Luminus SBT90.2
Price in USD at publication time: $149.95
Cell: Internal
Turbo Runtime High Runtime
LVP? Yes
Switch Type: E-Switch
Quiescent Current (mA): ?
On-Board Charging? Yes
Charge Port Type: Proprietary Magnetic
Chargetime
Power off Charge Port
Claimed Lumens (lm) 4800
Measured Lumens (at 30s) 2709 (56.4% of claim)*
Candela per Lumen 79
Claimed Throw (m) 1308
Candela (Calculated) in cd (at 30s) 7270lux @ 5.693m = 235623cd
Throw (Calculated) (m) 970.8 (74.2% 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 RT90 Luminus SBT-90.2 Flashlight what's included

  • Imalent RT90 Luminus SBT-90.2 flashlight
  • Nylon pouch
  • Charge cable (USB to proprietary magnetic)
  • Spare o-rings (2)

I did not get a manual, but I have the pdf direct from Imalent – view it below.

Package and Manual

Imalent RT90 Luminus SBT-90.2 Flashlight manual

Build Quality and Disassembly

Imalent RT90 Luminus SBT-90.2 Flashlight feature photo

Again, this is a can style light, but overall such a very unusual implementation of it.  The build quality is good.  There are a few surprises, but not with how the quality of the build.

Here’s this emitter…. the Luminus SBT-90.2.  It’s an unusual choice for a can light, indeed!

Imalent RT90 Luminus SBT-90.2 Flashlight emitter

And here’s the second unusual choice – the battery is built of four 18500 cells.  We’ve seen this setup before.  The Olight Olantern uses 4×18500.  This is neither good nor bad, of course.  Just unusual!  More on the battery pack later.

Imalent RT90 Luminus SBT-90.2 Flashlight tailcap branding

The body – or “cell tube” in this case – has ample but not aggressive knurling.

Imalent RT90 Luminus SBT-90.2 Flashlight headstanding

The bezel looks removable but I do not believe it is.  It’s a very nice bezel, too, with the crenelations that allow for light to escape when headstanding.

Imalent RT90 Luminus SBT-90.2 Flashlight bezel

The body has an indicator light, which can be red or green.

Imalent RT90 Luminus SBT-90.2 Flashlight indicator switch off

Here’s that indicator lighting green.

Imalent RT90 Luminus SBT-90.2 Flashlight indicator switch on green

Here’s a close up of the knurling.  It’s a diamond pattern, and not terribly grippy.

Imalent RT90 Luminus SBT-90.2 Flashlight body knurling

The reflector is very smooth (and again, very deep!)

Imalent RT90 Luminus SBT-90.2 Flashlight reflector

The switch is a little unusual.  More on it later.  It’s moderately easy to find without looking, and rotates freely in that opening!

Imalent RT90 Luminus SBT-90.2 Flashlight switch

Imalent RT90 Luminus SBT-90.2 Flashlight switch profile

Opposite the switch is the charge port.

Imalent RT90 Luminus SBT-90.2 Flashlight charge port

Imalent RT90 Luminus SBT-90.2 Flashlight charge port profile

Imalent RT90 Luminus SBT-90.2 Flashlight charge port connected

A nylon pouch is included too.

Imalent RT90 Luminus SBT-90.2 Flashlight nylon pouch

The head and body separate easily.  The threads are surprisingly short on this light….  Unscrewing the head from the body takes approximately one turn, which is very unusual.  Conversely that’s nice when putting the parts back together.  Also that the battery is built in as it is, makes screwing the parts back together very nice.  You’re not required to fight against cells pushing against parts in the head.  All in all this makes for a better experience.

Imalent RT90 Luminus SBT-90.2 Flashlight head off body

Only the head has a spring, and it’s a big beefy one.  The body has to be screwed tightly enough to push the external ring of the cell holder against the ring of the head, but that doesn’t require too much effort.  The threads are smooth.

Imalent RT90 Luminus SBT-90.2 Flashlight head spring body contacts

I found the threads to have a bit excessive lube.  They’re short, anodized, and square cut.

Imalent RT90 Luminus SBT-90.2 Flashlight thread detail

Also you can note here where the replacement o-rings would go if you ever needed them.

Imalent RT90 Luminus SBT-90.2 Flashlight battery body detail

Imalent RT90 Luminus SBT-90.2 Flashlight battery branding

Size and Comps

Product size: 65(head diameter)51(body diameter)127.5(length)mm

Net weight:428g(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

The only way for carry of the Imalent RT90 Luminus SBT-90.2 flashlight is an included nylon pouch.  The light must go in a “head up” orientation, and can’t be used while in the pouch.

Overall it’s a good pouch, and fits the light very specifically.

Power and Runtime

As mentioned above, the Imalent RT90 Luminus SBT-90.2 flashlight is powered by a built-in 4×18500 battery pack.  I have not confirmed with Imalent if this is replaceable, but very likely these will be available for separate purchase.  The battery pack is apparently a 2s2p configuration, because the fully charged voltage is around 8.35V.

Imalent RT90 Luminus SBT-90.2 Flashlight battery

This does mean that other similar Imalent lights that have the can-style body are absolutely not to be used with this battery body.  Those other bodies will definitely not work on this light either, unless they provide >6V (and I don’t believe any at this time do that.)

Imalent RT90 Luminus SBT-90.2 Flashlight battery

I did not disassemble the battery, but I may yet.  I’m interested to see the cells used, and if they’re soldered in.  My guess is that they are soldered in place.

Imalent RT90 Luminus SBT-90.2 Flashlight battery and contact

Here are a number of runtimes.  Turbo steps down quickly and dramatically, but does hit the 4800 lumen claim at startup.  Around 1000 lumens for an hour isn’t bad, either.

Imalent RT90 Luminus SBT-90.2 Flashlight runtime turbo

High steps down too, but maintains just a little longer.  After the stepdown, the profile looks just the same.

Imalent RT90 Luminus SBT-90.2 Flashlight runtime high

Imalent RT90 Luminus SBT-90.2 Flashlight runtime medium

In all tests, the light does shut off with low voltage protection.  There’s also an indicator warning of low voltage on the side of the light.  This side light turns red on low voltage.

On bench power testing, the RT90 indicating lights turned red at 6.5V, and at 5.5V everything shut off completely.

Also included on the RT90 is on-board charging.  This is by way of the standard Imalent charge port – USB to proprietary magnetic.  Despite being an 8.4V battery, the charge cable takes 5V input.  Ie there are no issues there.

The charge port on the light is two exposed metal dots.  The connection seems stronger than some early iterations of this connector.  It snaps into place very readily.

Here’s how the connector attaches.  The cord should go toward the tail of the light.

Imalent RT90 Luminus SBT-90.2 Flashlight charge port connected

Charging is very good, at around 2A, or 10W for over 2 hours.  Total charge time is under 3 hours in all my testing.  And the final voltage is consistent at 8.35V, which is good for the cells.

Imalent RT90 Luminus SBT-90.2 Flashlight charge graph

Modes and Currents

Mode Mode Claimed Output (lm) Claimed Runtime Measured Lumens Tailcap Amps
at 8.4V
Turbo 4800/1350 70s/85m 2709 12.49
High 2800/1350 90s/93m 2709 7.50
Middle 1350 1h40m 2.14
Middle Low 350 2h40m 0.61
Low 10 90h 0.03

It’s just complete random chance that both of the high outputs are 2709 at 30 seconds….  But I double checked my data, and that’s accurate!  How random – last review a light was rated at 1100 lumens and was exactly 1100 lumens at 30s.  And now this.  Maybe this means things are lining up.  We’ll say that for 2021, ok?  2021 is looking good!

PWM

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 RT90.  It’s an e-switch, it’s on the head, and it has a plastic cover.  The action is very low but it clicks very positively.  The switch itself is not an indicating switch, but there’s a red/green indicator just near.

The switch sits almost flush with the surrounding body.  It is also directly opposite the charge port on the body, so just by feel it could be somewhat difficult to differentiate.

Here’s a UI table!  This user interface seems to be just like the Imalent MS06, which shares the style of the RT90.

State Action Result
Off Click On (Mode Memory (excluding Turbo/Strobe)
On Click Off
On Hold Mode cycle (10/350/1500/2800 order)
Any Triple Click Low
Turbo Double Click Strobe
Off Hold Iterate the indicator switch (on or off)
Off Click 4x Iterate Lock (indicated by 3x flashing of green indicating LED)

This is generally the same UI as the MS03, which I have also reviewed.

LED and Beam

The Imalent RT90 has a Luminus SBT-90.2 emitter.  This emitter is a real beast.

Imalent RT90 Luminus SBT-90.2 Flashlight emitter

The emitter benefits from a smooth deep reflector.  Again, the reflector in this size light is a real standout.

Imalent RT90 Luminus SBT-90.2 Flashlight reflector

These beamshots are always with the following settings:  f8, ISO100, 0.3s shutter, and manual 5000K exposure.

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

Test light is on the left!

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

Conclusion

What I like

  • Very good thrower in a can style light
  • Beam temperature is not unpleasant
  • User interface is good, and consistent with other Imalents
  • On-board charging is reliable at ~10W
  • The proprietary magnetic charging is the Imalent standard.

What I don’t like

  • Battery is built in, and replacements are unclear
  • Proprietary magnetic charging
  • PWM on lower modes (but it’s fast and not really noticeable)
  • Mode spacing between the two lowest modes is too broad

Notes

  • This light was provided by Imalent for review. I was not paid to write this review.
  • This content originally appeared at zeroair.org.  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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Author: zeroair

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