Coast Polysteel 600R Flashlight Review

Coast Polysteel 600R Flashlight Review

The Coast Polysteel 600R Flashlight looks like a fun light, and Coast sent one out for review.  It’s a plastic zoomy with batteries included.

Official Specs and Features

Here’s a link to the Coast Polysteel 600R Flashlight product page.


There’s only one version, but the body is available in black, red, blue, green, and orange.


These are going for $70 right now on the Coast website.

Short Review

As much as I wanted to like this light, there’s pretty much nothing I like about it.  There are two big deal breakers for me though.  First of all the size, which I didn’t find very obvious from the product page – you’ll have that settled here since I’ll make it clear.  And secondly was the PWM.  The PWM on this light is very bad, and even noticeable on the highest mode.

All that said, I think the light is most accurately represented by Coast, and while a bit expensive on their site, it’s available for less elsewhere.  If this fits your criteria, and you can live with the PWM, then it is a nicely colored option.

Long Review

The Big Table

Coast Polysteel 600R Orange
Emitter: ?
Price in USD at publication time: $70.00
Cell: 1xCustom 18650
High Runtime Medium Runtime
Switch Type: Mechanical
On-Board Charging? Yes
Power off Charge Port with no Cell?
Claimed Lumens (lm) 530
Measured Lumens (at 30s) 447 (84.3% of claim)^
Claimed Throw (m) 209
Candela (Calculated) in cd (at 30s) 447lux @ 5.114m = 11690cd
Throw (Calculated) (m) 216.2 (103.4% of claim)^


Cell: 4xAA
High Runtime
LVP? Yes
On-Board Charging? No
Claimed Lumens (lm) 710
Measured Lumens (at 30s) 625 (88% of claim)^
Claimed Throw (m) 247
Candela (Calculated) in cd (at 30s) 458lux @ 5.495m = 13829cd
Throw (Calculated) (m) 235.2 (95.2% of claim)^
All my Coast 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

  • Coast Polysteel 600R Zoomie Flashlight
  • Battery Pack: 4xAA (cells included)
  • Battery Pack: Custom 18650 with on-board charging and USB out
  • Cigarette USB adapter
  • Wall USB adapter
  • Charge cable (USB to micro-USB)

Package and Manual

The box this light ships in is a big box, with lots of printing.  Slip fit box, with reliefs for opening – it’s a nice box.

The light does not come with a manual.

Build Quality and Disassembly

The color is exactly what I’d hoped.  It’s the right orange (or close enough).  The whole body is plastic (aka “polysteel”).  There’s some grip pattern on the body, too.

The tailcap has a spring and is held together by three screws.  Even the threads on the body are plastic, but they’re sufficient.  You can also see the metal sleeve which runs inside the body – required for electrical connection from the tailcap.

The head does not have a spring but has this…. contact pad.  It’s not a typical pad.

Here’s the business end.

I didn’t disassemble this light.  It’s… glued?  Or any way resists unscrewing enough that I didn’t want to fight it.

Size and Comps

The weight is 340g, but the dimensions are not mentioned.

The light is around 8″ long when in flood mode, and 8.25″ when zoomed in.  It’s just under 2″ in diameter in the head area, and somewhat thinner in the body.

This is not a small light.  That’s fine, I often review not-small lights.  In fact, some of my favorite lights are not small lights.  But wow does this one carry big, for what’s essentially a single 18650 light.

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 formats.

Retention and Carry

The only thing included for carry is the coffee-mug tailcap handle.  Through this could be attached a lanyard or strap of some sort – but one is not included.

Power and Runtime

Coast includes two options for powering the Polysteel 600R.  On the left below is the built-in 18650 with on-board charging and USB output.  On the right is a 4xAA cell – 4x AA cells are included.  These cells are in series – you’ll need all 4 to run the light.

These Duracells don’t appear to be different, but the holder seems fickle.  In order to get my NiMH cells to work, I had to throw in a little contact magnet on the positive end of one.  The NiMH are standard, so I really don’t know what was the problem.  I can tell you that the light worked much more reliably on the li-ion setup.  In fact, after the runtime with the AA pack, the light would no longer work on the AA pack.  I couldn’t explain that either – the voltage from charged AA’s in the pack was just fine.  Randomly later, the light did start working again with the pack – it was a problem I never could explain.

The lithium-ion pack has USB-out on one side of the negative end, and a micro-USB in on the other.

There is no LVP at all on this light, at least with the lithium-ion pack.  – that’s right, it discharged the lithium-ion to 0.0V.  Furthermore, when charging the lithium-ion pack backup, it did not do so softly.  It hit the completely depleted lithium-ion pack with the full current from right at the start.



It did seem to shut off when using the AA pack, with cell voltage around 1.15V.

Modes and Currents

Mode Mode Claimed Output (lm) Claimed Runtime Measured Lumens Tailcap Amps
High AA Pack 710 5h45m 625 2.08
High Liion Pack 530 5h45m 447 2.08
Medium 155 9h30m 116 0.51
Low 42 35h 24 0.12

Pulse Width Modulation

PWM is present even on high.  I found the PWM on low to be absolutely off-putting.  Moving the light around on low makes an almost strobe-like effect.

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, so it’ll be easier to compare to the test light.  Unfortunately, the PWM on this light is so bad that it doesn’t even work with my normal scale, with is 50 microseconds (50us).  10ms5ms2ms1ms0.5ms0.2ms.  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 too.

User Interface and Operation

There’s a single switch on this light.  It’s a mechanical forward clicky on the tailcap.  It’s also completely normal-sized, despite looking tiny in the gigantic tailcap.  The rubber has a lot of texture and impressively has Coast’s “C” logo.

Here’s a UI table!

State Action Result
Off Click On^
Off Half press Momentary
Off Repeated Half press Mode advance (HML)

^ Generally the light will come on in high.  If you multiple click or multiple half-press quickly enough, you will advance the modes.  Normal forward clicky behavior.

LED and Beam

Coast doesn’t make a claim on what this emitter is.

Comparing the photo above to this incredibly handy list on BLF by CRX, I’d say it’s a Cree XM-L2, of unknown (but cool) temperature.

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

4xAA pack first.  Flood on the left, zoom on the right.

Lithium-ion pack second.  The high is noticeably (but little) brighter.

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

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

Random Comparisons and Competitive Options….

Here’s a link to a relevantly filtered page on  I use that site a lot!  Most of those are not zoomie lights, so if zoomie is what you really need, then this could be your choice.


What I like

  • The color is great
  • The UI is dead simple

What I don’t like

  • PWM
  • No LVP on included battery pack
  • 4xAA pack was cell-picky and unreliable
  • The size


  • This light was provided by Coast 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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