Review Surefire M600DF [Dual Fuel] Scout Weapon Light

Surefire m600df external packaging

In this review guide, let's check out the latest SureFire M600DF (Dual Fuel).

The SF M600 Dual Fuel model uses the latest 3.6V 18650 battery technology that the weapon light industry is pushing towards in its wider body & slightly longer in length that is capable of outputting 1500 lumens & 16000 candela.

 Does it deliver the performance?

Let's find out...


  • 1500 Lumens & 16000 Candela (1X 18560 Battery)
  • 1200 Lumens & 12800 Candela (2X CR123A Batteries)
  • 1.125" Bezel Diameter
  • TIR Lens
  • Recoil isolated electronics
  • Mil-Spec Hard Anodized
  • IPX7
  • 5.56" Overall Length (varies based on end cap selection)
  • 5.15 oz
  • 6061 T6 Aerospace Aluminum

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What's Included In The Packaging

Surefire m600df packaging backside
Surefire M600DF black packaging

The SF M600DF comes in a nice premium quality packaging that is currently the new standard for all Surefire products.

In the package you will receive:

  • Surefire M600DF
  • Thumb screw mount
  • Z68 tail cap switch
  • 1 18650 battery
  • USB charging cord
  • Surefire sticker
  • 18650 battery manual
  • User manual
  • Warranty card

Who Benefit From Using SF M600DF

surefire m600df light beam pan

The Surefire M600DF scout light is the go to light for long gun applications within 50 - 70 yards with a wide spill & hot spot to positively identify things in low light.

  • Law enforcement
  • Low light training & drill
  • Home defense
  • Hunting

Core Features & Performance

Surefire m600df disassembled

Lumen Intensity

The M600DF has 1500 lumens when using the 18650 battery, and 1200 lumens on CR123A.

Surefire m600df close up beam pattern

Candela

The M600DF's 16000 candela performance on a full battery charge can throw as far as 250 meters as marketed, but based on testing, the most effective range is about 120 meters.

For in door and mid range applications, the M600DF is a great option.

However, past that mid range distance is where we need to look at an aftermarket light head such as the MODLITE PLHv2 head to see things in the dark with much more focus.

Beam Pattern

The TIR lens has the widest and the brightest spill based on our testing among other weapon lights on the market.

Comparing to the original M600, the beam has much more flood, and it's not as tight.

For home defense use within 50 yards, the light's wide spill provides the shooter plenty of peripheral illumination to identify the surroundings in low light conditions without having to point the hot spot at everything the user tries to identify.

Surefire M600DF - Wider and brighter close up flood

Surefire M600DF light beam pattern

Warehouse corridor, much wider flood

surefire m600df TIR lens wide spill

Much softer light beam, weaker hot spot, but it can lit up the room close up very well

Solution for more throw

The MODLITE PLHv2 is compatible with Surefire M600DF 18650 body

Surefire M600DF vs MODLITE PLHv2 head

MODLITE PLHv2 - More Throw

MODLITE plhv2 head light beam

Much tighter hot spot that throws far. Great for threat control while keeping a safe distance.

MODLITE plhv2 light beam indoor

Throws brighter flood indoor

modlite plhv2 throw outdoor

Much more concentrated beam than regular lights

Here is the default M600DF head using 18650 battery (full charge)

Surefire m600DF throw outdoor

~ 156 ft, less bright than MODLITE PLHv2

The hot spot is actually not as tight as  the previous generation of M600 Scout light, so even with increased lumen intensity the hot spot isn't strong enough past ~80 yards to clearly identify objects hidden behind trees lines or other obscuring objects in low light.

Light Head & Upgrades

Surefire m600df vs m600 scout

The SF M600DF's light bezel is completely redesigned compared to the older 600 lumen M600 Scout light head.

So the New M600DF head features the TIR lens that provides a wide spill for close up peripherial illumination and better punch compared to the old M600 Scout where Candela rating is important, which we have already covered above.

Surefire m600df head vs original m600 scout head
surefire m600df head connector

In order to upgrade the M600DF, the user can purchase compatible MODLITE OKW or PLHv2 heads for higher candela output.

Battery

surefire 18650 rechargeable battery for SF m600df

The new 18650 battery is the biggest upgrade for the M600DF for higher output. 

The rechargeable 18650 battery provides much higher output & saves money compared to using the old CR123A battery technology.

If you train a lot with a weapon light, you can easily go through 170+ batteries a year (Adds up to be about $320/yr)

We recommend getting 2 backup 18650 batteries from Surefire & a USB portable battery bank to keep this light topped off & ready to go at any time.

Tail Cap Attachments & Switches

Surefire m600df on benelli m4 handguard
benelli m4 with surefire m600 unity tactical hotbutton
surefire m600df on scar 17

The Surefire Scout light can accept various end cap attachments for better light activation and there are tons of accessories available.

Surefire makes a few end cap attachments & tap switches that the users can buy separately which include:

dbal with surefire m600df on mk18

The user can also purchase other aftermarket pressure switches from reputable brands that make durable & responsive light activation switches for the Surefire Scout weapon light

Some of these products include:

  • Unity Hot Button
  • TNVC TAPS
  • Cloud Defensive LCS

Overall Durability & Feel

unity tactical modbutton surefire m300c on mk18

The Surefire M600DF feels sturdy just like any other Surefire weapon lights. It feels solid and the finish feels high quality.

The only thing we would change prior to mounting it on a rifle would be swapping out factory thumb screw mount with a high quality offset scout light mount

The thumb screw tends to get loose after rapid fire, so a dedicated scout mount secures the light the best.

Check out other light mounts here


Torture Test

Under normal use, the light will last for a long time. 

The light can survive drop and typical rough handling, but the lens do crack if receiving a direct hit from airsoft bbs or simunition rounds at about 350 - 600 fps.

If the bezel experiences repeated hard impacts, it will crack the lens, battery and destroy the light, but under normal circumstances this would mostly not happen unless being crushed intentionally.

Since everyone wants to know how the light can handle extreme torture tests before it eventually goes out, we recommend you check out this video below:


Final Verdict

Pros

  • Tough built
    Compatible with all existing Surefire accessories
  • Wide spill that lights up the whole surrounding
  • 18650 rechargeable battery to save money
  • Increased lumen & candela output than previous model
  • Compatible with MODLITE head
  • Same scout mounting footprint
  • Effective light beam without a doubt within 50 yards

Cons

  • Dimmed hot spot for targets beyond 80+ yards
  • 16K Candela still not strong enough for low light 100+ yards application
Surefire-M600-black

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Common FAQ

How Good Is Surefire's Warranty Policy?

If you damage the bezel glass, tail cap, or the body, Surefire will replace your light at no cost period except for intentional damages.

How Long Does It Take To Charge SF18650B Lithium Battery?

The Surefire SF18650B battery can be charged via the micro USB type B cord that came with the light. The charge time for a fully depleted battery can be over 5 hours via the micro USB cord.

Once the battery is connected to a power source, the 2 LED indicators display the current charge state:

  • RED means charging
  • GREEN means fully charged

If you want to speed up the charge speed, please use a dedicated 18650 CC-CV compatible cradle charger.

Can The Factory Thumb Screw Mount Be Uninstalled?

Yes, the thumb screw mount that comes with the Surefire M600DF Scout can be uninstalled by removing the two hex screws.

The user can install other Surefire scout footprint mounts to the light based on preference.

How To Spot A Fake Surefire Product

Fake Surefire products generally have the wrong dimension, slightly questionable brand logo and body profile. It's very easy to spot for people who actually own real Surefire products.

When buying Surefire products online, please purchase it from reputable vendors.

When purchasing the light from Amazon, please be sure the seller on the product page is from a reputable vendor as well.