JETBeam Mark 1 IBS Flashlight Review

JETBeam Mark 1 IBS Flashlight Review

The JETBeam Mark 1 IBS flashlight runs both a 14500 (included!) or a single AA (1.5V) cell. It has a tail switch and uses one Cree XP-L HD emitter. Read on!


Official Specs and Features

Here’s a tracking link to the product page at flashlightgo.com.

Versions

It looks like there are a couple of body colors of the JETBeam Mark 1 IBS flashlight available. I have a more natural anodization but it looks like black is also available. This is an iterative product too – there’s at least one previous (much older) version.

Price

The JETBeam Mark 1 IBS flashlight sells for $38.99 at flashlightgo.com.


What’s Included

JETBeam Mark 1 IBS flashlight what's included

  • JETBeam Mark 1 IBS flashlight
  • 880mAh 14500
  • Charging cable
  • Lanyard
  • Spare o-ring
  • Manual etc

Package and Manual

JETBeam Mark 1 IBS flashlight box

JETBeam Mark 1 IBS flashlight manual

 

Build Quality and Disassembly

JETBeam Mark 1 IBS flashlight

The JETBeam Mark 1 IBS flashlight has a familiar build quality for JETBeam lights. And for a $39 light, it could easily be considered a value!

While it’s built well, there are a few design choices I do not like. Even if this light is tactical, I don’t like how much the switch cover protrudes. That prevents all tailstanding. I do like that stainless ring, though! If I had my way, the metal ring would cover the switch, and if you needed a tactical AA/14500 light, you could just unscrew that ring. I tried and couldn’t get this ring to unscrew.

Despite whatever I said about this light being “tactical” – I wouldn’t consider it tactical. The head end has only a button for contact on the cell.

JETBeam Mark 1 IBS flashlight showing positive contact

Below you can see the tailcap, which has unanodized threads and a big spring. Only the tailcap comes off. The head and cell tube are one piece!

JETBeam Mark 1 IBS flashlight tailcap off showing threads and spring

Size and Comps

Length: 95mm
Head Size: 20mm
Weight: 37g (Exclude Battery)

If the flashlight will headstand, I’ll show it here (usually the third photo). If the flashlight will tailstand, I’ll also show that (usually in the fourth photo).

JETBeam Mark 1 IBS flashlight in hand

Here’s the test light with the venerable Convoy S2+. The version you see below is a custom Convoy S2+ host that’s been laser engraved by GadgetConnections.com. I did a full post on an engraved orange host right here! Or just go straight to GadgetConnections.com to buy your Convoy S2+ now!

Also above is the light beside a TorchLAB BOSS 35, an 18350 light. I reviewed the aluminum version of that light in both 35 and 70 formats. I also reviewed that specific edition, the “Oveready BOSS FT Collector Vintage Brass” 35. I love it!

Retention and Carry

Only this lanyard is included as a means to carry the JETBeam Mark 1 IBS flashlight. The lanyard attaches through this stainless ring on the tailcap.

JETBeam Mark 1 IBS flashlight with included lanyard attached

Below you can see the lanyard as it ships. This photo is included for no reason except that I love the way the lanyard is capturing itself for shipping.

JETBeam Mark 1 IBS flashlight lanyard

Power and Runtime

JETBeam includes this 880mAh 14500 cell for running the JETBeam Mark 1 IBS flashlight.

JETBeam Mark 1 IBS flashlight with included 14500 cell

The cell goes into the light in the usual way – the positive end (button) toward the head.

JETBeam Mark 1 IBS flashlight with included 14500 cell installed

Here are a couple of runtime tests. There are only three modes; below are tests on the higher two with the included 14500 cell.JETBeam Mark 1 IBS flashlight runtime graph

JETBeam Mark 1 IBS flashlight runtime graph

JETBeam Mark 1 IBS flashlight runtime graph

The light does shut off with low voltage protection at around 3V. According to the manual, the light should flash to indicate approximate cell voltage (or technically “saturation”) but the runtimes do not support that.

One bonus about the JETBeam Mark 1 IBS flashlight is that it’ll run alkaline or NiMH cells, too! JETBeam doesn’t include an AA so I have not tested runtimes with that. Output is much lower when using any 1.5V cell.

Charging

The JETBeam Mark 1 IBS flashlight itself does not have built-in charging but the included 14500 does. That’s by way of a USB-C charging port on the positive end.

JETBeam Mark 1 IBS flashlight charging port on cell

An A to C cable is included.

JETBeam Mark 1 IBS flashlight included charging cable

Both C to C and A to C charging work fine. They both require around 2.5 hours to complete. That’s a little slow but should provide a nice long life for the cell.

JETBeam Mark 1 IBS flashlight charging graph

Modes and Currents

Mode Mode Claimed Output (lm) Claimed Runtime Measured Lumens Tailcap Amps
14500 – High 700 1.2h 552 (0s)
539 (30s)
1.21 @4.2V
14500 – Medium 100 4.2h 95 (0s)
93 (30s)
0.17 @4.2V
14500 – Low 2 72h 8.5 0.01 @4.2V
AA – High 220 2.4h 122 2.5 @1.5V
AA – Medium 100 2.9h 81 0.56 @1.5V
AA – Low 2 45h 7.4 0.06 @1.5V

Pulse Width Modulation

None of the modes use PWM. The order is LMH 14500 then LMH AA.

For reference, here’s a baseline shot, with all the room lights off and almost nothing hitting the sensor. Also, here’s the light with the worst PWM I could find. I’m adding multiple timescales, comparing them to the test light will be easier. Unfortunately, the PWM on this light is so bad that it doesn’t even work with my normal scale, which is 50 microseconds (50us). 10ms. 5ms. 2ms. 1ms. 0.5ms. 0.2ms. In a display faster than 0.2ms or so, the on/off cycle is more than one screen, so it’d just (very incorrectly) look like a flat line. I wrote more about this Ultrafire WF-602C flashlight and explained a little about PWM.

User Interface and Operation

A single tail switch controls the JETBeam Mark 1 IBS flashlight. It’s a reverse clicky and is extremely sensitive. I’m not actually sure this is a reverse clicky. The light can change modes while on but also has momentary output while off. I’m not sure what kind of mechanical switch offers both of those options!

JETBeam Mark 1 IBS flashlight tail switchThe switch is very proud, fully preventing tailstanding.

JETBeam Mark 1 IBS flashlight tail switch profile view

JETBeam Mark 1 IBS flashlight tail switch actuation

Here’s a UI table!

State Action Result
Off Click On (Mode memory)
Off Tap Momentary output
On Click Off
On (within 3 seconds of turning on) Tap Mode advance (LMHStrobe)
On for more than 3 seconds Click off, tap 3x then hold Stepless programming^
On strobe more than 3 second “Half pressing the tail switch within 1 second” Special mode selection (Strobe > SOS > Battery Level > Bicycle > Beacon)^^

^ I could not get this to work. Alternately: I might have gotten it to work a little (But see the next line.)
^^ I was technically able to enter this mode but was unable to program the light. In fact, programming is truly bad on this light. You’d certainly never do it on the fly to check the battery level, for example.

LED and Beam

This light uses a CREE XP-L according to the manual. And we can see the dome, so we know it’s the HD version.

JETBeam Mark 1 IBS flashlight emitter

JETBeam Mark 1 IBS flashlight toothy bezel

JETBeam Mark 1 IBS flashlight emitter on

JETBeam Mark 1 IBS flashlight emitter on

LED Color Report (CRI and CCT)

Below you can see the CRI and CCT for the same order as above in the PWM section. In short: CR

Beamshots

These beamshots are always with the following settings:  f8, ISO100, 0.3s shutter, and manual 5000K exposure. These photos are taken at floor level and the beam hits the ceiling around 9 feet away. Same mode order as above.

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

I keep the test flashlight on the left, and the BLF-348 reference flashlight on the right.

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

Summary and Conclusion

I am simply not impressed with the JETBeam Mark 1 IBS flashlight. I like it in theory but the switch is way too sensitive and I got constant accidental mode changes and programming the light is extraordinarily difficult. It’s probably easy if you know how but the manual was just not clear to me. This isn’t a new light, so we can probably overlook the cool white, low CRI Cree XP-L HD emitter, but I’m not sure about modability, either – the head and cell tube are just one piece (though the toothy bezel (which I love) is likely just screwed in). For $39 this might be a good host to start from if you want to do an emitter and switch swap for an AA light.

The Big Table

JETBeam Mark 1 IBS flashlight
Emitter: Cree XP-L
Price in USD at publication time: $38.99
Cell: 1×14500
Runtime Graphs
LVP? Yes
Switch Type: Mechanical
On-Board Charging? Yes
Charge Port Type: USB-C (on cell)
Charge Graph
Power off Charge Port No
Claimed Lumens (lm) (14500) 700
Measured Lumens (at 30s) (14500) 539 (77% of claim)^
Candela per Lumen 6.7
Claimed Throw (m) (14500) 150
Candela (Calculated) in cd (at 30s) (14500) 143lux @ 5.009m = 3588cd
Throw (Calculated) (m) (14500) 119.8 (79.9% of claim)^
Claimed Lumens (lm) (AA) 220
Measured Lumens (at 30s) (AA) 122 (55.5% of claim)^
Candela per Lumen (AA) 6.3
Claimed CCT
Measured CCT Range (K) 6200-6800 Kelvin
Item provided for review by: Flashlightgo.com
All my JETBeam reviews!

^ Measurement disclaimer:  Testing flashlights is my hobby. I use hobbyist-level equipment for testing, including some I made myself. Try not to get buried in the details of manufacturer specifications versus measurements recorded here; A certain amount of difference (say, 10 or 15%) is perfectly reasonable.

What I like

  • Good build quality.
  • Nice use of stainless parts
  • Runs both 14500 and AA cells!

What I don’t like

  • Super sensitive switch
  • Massively hard to program
  • Nice second mode group but hidden behind the difficult program.
  • Very proud tail switch cover

Notes

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