acebeam h17 nichia 18350 laying on side

Today I have a neat little light by Acebeam; the H17.  It’s a triple emitter 18350 headlamp!  Mine’s Nichia 219c – read on for some testing and thoughts!

Official Specs and Features

Here’s a referral link to the official product page.


There are two versions of the H17 – Nichia 219c LEDs CRI≥90 (5000K) (seen here), and a Samsung LH351D LEDs CRI≥90 (6500K).


These headlamps are going for $59.90 at the moment.  Buy yours at! (referral link)

Short Review

This is a great headlamp.  I’m pleased it’s offered in two emitter options, with both being high CRI.  The user interface is very good, the output and throw are very good.  All in all this is a fantastic little option.  I would prefer the light to include a regular 18350 cell instead of one with charging, and also be just that much shorter (maybe 4-5mm).

Long Review

The Big Table

Acebeam H17
Emitter: Nichia 219c (CRI ≥90 5000K (Triple))
Price in USD at publication time: $59.90 at (referral link)
Cell: 1×18350
Turbo Runtime High Runtime
LVP? Yes
Switch Type: E-Switch
Quiescent Current (A): 0.00007
On-Board Charging? Yes
Charge Port Type: micro-USB
Power off Charge Port with no cell?
Claimed Lumens (lm) 1500
Measured Lumens (at 30s) 1246 (83.1% of claim)*
Candela per Lumen 5.3
Claimed Throw (m) 158
Candela (Calculated) in cd (at 30s) 352lux @ 4.481m = 7068cd
Throw (Calculated) (m) 168.1 (106.4% of claim)*
All my Acebeam 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

acebeam h17 nichia 18350 what's included

  • Acebeam H17 Headlamp
  • Acebeam 1100mAh 18350 with micro-USB charge port
  • Spare o-rings (2)
  • Pocket clip
  • Headband
  • Charge cable (USB to micro-USB)
  • Manual etc

Package and Manual

Build Quality and Disassembly

The H17 headlamp is a well built light.  If you’ve had an Acebeam flashlight before you probably already expect that.  This one is no different.  It’s also a very refined product.

The accents are interestingly a rose gold color, seen on both the bezel around the emitters, and the bezel around the switch.

There isn’t really any knurling, but that’s fine since you really expect this as a headlamp use light, instead of a handheld use light.

The tailcap has grooves which help with removal.  The tailcap is also rounded on the base, which I found to be an unusual feature, which added greatly to comfort when unscrewing.

The switch cover has a bit of knurling.

There isn’t all that much branding or writing, but it’s concentrated on the tailcap.

The head has some texture which should help with cooling.

The bezel for the switch is proud, but does completely protect the switch, so the light will headstand.

The tailcap has a magnet, and also a thick spring.

The head also has a spring, but it’s much smaller.  There’s also a bit of usual “conformal coating” (which isn’t really conformal coating, I think it’s just a sticker).

The threads are short, anodized and appropriately lubed.

The light is serialized, too!

Size and Comps

Size: 79mm (Length) x 24.3mm (Head Diameter) x 24mm (Tube Diameter)
Weight: 43.8g(1.54oz.) w/o battery; 70.2g(2.48oz.) w/ battery

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

This light is primarily a headlamp, though as a “right angle” light it can double as a handheld/pocket light, too.

The included headband connects to the light by way of a silicone holder.

Overall the headband is very nice.  It includes an over-the-head strap, which can be removed with relative ease.

The top band connects just over the side strap, and isn’t an integral part (by which I mean it can be removed cleanly from the back connection.)

All of the strap backs have squiggles of grippy stripes.

Here’s the light in the strap.  It’s not hard to adjust, and fits securely.

The headband connectors fit in the same place as the pocket clip.  You could likely force it, but the two are not at all intended to be used concurrently.

Speaking of the clip – it also bears the rose gold finish color.  The clip can fit on the head or tail end, though on the tail end the clip shoulder would stick over the end of the light.  So realistically this (below) is the only way.  This is a fairly standard friction fit clip.

Also included is a magnet in the tailcap.  This magnet holds the light securely, and I believe is removable by first pulling out the spring in the tailcap.

Power and Runtime

Acebeam powered this H17 headlamp by a single lithium ion cell.  An appropriate cell is included – a 1100mAh 18350.  This is not really a specialized cell, but it does have a micro-USB charging port on the positive end.

The cell is a button top.

The charge port adds a bunch of length to the cell, and assuming the light is built around the cell, subsequently adds a bit of length to the light too.  A regular 18350 cell works fine in this light, and I’d much rather have a shorter light than have a cell with build in charging.

The cell is installed in the usual direction – positive end toward the head.

Here are a few runtimes, of the highest modes.  Turbo doesn’t quite hit the spec of 1500 lumens, but it’s fairly close.  After the stepdown, the light is very well regulated.  When the cell voltage drops below around 2.7V, the emitters will flash, and soon the light sill shut off.

In the graph below, the temperature probe unfortunately disconnected from the light.  So please disregard the temp after around 9 minutes.  Sorry about that.

The included cell has a micro-USB charge port on the positive end.

An appropriate cable is included – USB to micro-USB.

Charging looks okay but I’m not really sure why the current drifts down after the initial ~1A.  Still charging takes just over 1 hour.

Modes and Currents

Mode Mode Claimed Output (lm) Claimed Runtime Measured Lumens Tailcap Amps
Turbo 1500 1h 1249 6.36
High 580 1h15m 499 1.65
Medium2 230 1h30m 194 0.56
Medium1 90 4h15m 79 0.21
Low 20 17h 31 0.07
Ultra-Low 1 200h ~ 7.5mA

Pulse Width Modulation

No PWM on any mode!  So that’s great!

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

This Acebeam H17 18350 Nichia headlamp is controlled by a single e-switch on the head end of the light.  That should make it very easy to find without looking.  The switch also covers enough of the end that it’ll be easy to hit.

But the switch is shrouded by this bezel, so it won’t be activated much accidentally.

Here’s a UI table!

State Action Result
Off Click On (mode memory, excluding Ultra-Low and Turbo)
On Hold Mode Advance (Low > Med1 > Med2 > High)
Any Double Click Turbo
Off Hold Ultra-Low
Turbo Double Click Previous mode
Any Triple Click Strobe
Off Hold >3s Lockout (signified by 3 flashes)
Locked Hold 6s Unlock to Low

LED and Beam

My review copy of the H17 headlamp has Nichia 219c emitters.  The Nichia option has a temperature of 5000K.  If you prefer more output or cooler temperatures, get the Samsung – it’s 6500K and has a higher lumen rating.

But give me the warmer version any day.  I’ll gladly sacrifice the output.

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

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

  • High output – despite not hitting 1500 lumens, 1246 lumens is very bright!
  • Six modes is a nice selection of modes
  • No PWM at all
  • Offers high CRI with both emitter options!

What I don’t like

  • Slow mode cycle
  • Low isn’t quite as low as I’d like


  • This light was provided by 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!
  • Use my referral link if you’re willing to help support making more reviews like this one!

3 thoughts on “Acebeam H17 with Nichia 219c Headlamp Review”

  1. Will it work with a CR123 primary in a pinch? I can’t find that info on the manufactures website.

    1. The manual doesn’t cover it but based on testing with the bench power, I found this:

      When the cell voltage drops below around 2.7V, the emitters will flash, and soon the light sill shut off.

      So even if it did work, it would definitely not be at full capacity (ie, no turbo, and probably even no higher modes).

      I tested with both CR123 (3V) and RCR123 and the H17 did not turn on at all. So the answer to your question is “no.”

  2. Pingback: Skilhunt H04 Mini RC 18350 Headlamp - ZeroAir Reviews

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