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
- 5.56" Overall Length (varies based on end cap selection)
- 5.15 oz
- 6061 T6 Aerospace Aluminum
What's Included In The 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
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
Core Features & Performance
The M600DF has 1500 lumens when using the 18650 battery, and 1200 lumens on CR123A.
Lumen intensity is the brightness measurement at the light bulb, and it's what the manufacturer uses to promote their products, but it's not the most important thing to look for until you examine the light's Candela rating, which we will talk about next.
The M600DF's 16000 candela can throw as far as 250 meters as marketed but based on testing, the most effective range is about 120 meters before it completely dims down.
For anyone using this light for home defense or doing any close-up 70 yrd night shooting drills, the M600DF is a great option no doubt.
If you want more candela for distances up to 100 yards or more with a more concentrated hot spot without the light intensity dimmed down, please check out the MODLITE PLHv2 head or the latest Cloud Defensive REIN.
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
Solution for more throw
The MODLITE PLHv2 is compatible with Surefire M600DF 18650 body
MODLITE PLHv2 - More Throw
Here is the default M600DF head using 18650 battery (full charge)
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
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.
In order to upgrade the M600DF, the user can purchase compatible MODLITE OKW or PLHv2 heads for higher candela output.
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
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:
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
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.
Under normal use, the light will last for a long time. However, the SF M600DF is designed for military use, so the light must survive some physical abuse illustrated in this video below:
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:
- Tough built
- Wide spill that lights up the whole surrounding
- 18650 rechargeable battery to save money
- Increased lumen & candela output than previous model
- Same scout mounting footprint
- Effective light beam without a doubt within 50 yards
- Dimmed hot spot for targets beyond 80+ yards
- 16K Candela still not strong enough for low light 100+ yards application
The M600DF Scout fundamentally stays the same as the previous M600 Scout as far as the overall body profile & design.
The new rechargeable 18650 battery technology finally enabled the Surefire Scout light to having a higher output that CR123A batteries are not able to perform.
The TIR lens combined with higher output makes the M600DF great for indoor & outdoor within 70 yards before it loses its effectiveness.
For higher output we recommend swapping the head to a PLHv2 for more concentrated throw performance.
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.