On the SF18350 rechargeable, the M340DF Pro outputs 650 lumens and 95,000 candela with a 45-minute runtime. On a single CR123A primary, it outputs 350 lumens and 55,000 candela with a 1-hour runtime. The 18350 gives you peak performance; the CR123A gives you longer runtime and universal battery availability. Both modes are fully capable for real-world use — the 55,000 candela output on 123A is still enough beam intensity for most close-to-medium range work. Runtime measurements follow ANSI/PLATO FL1 standards (time to 10% of original output).

"Turbo" designates SureFire’s tightly focused TIR (Total Internal Reflection) lens configuration, as opposed to their flood or medium-throw variants. A TIR lens works by surrounding the LED with a precisely shaped polymer optic that captures light emitted at wide angles — light that a traditional reflector would scatter — and redirects it forward through internal reflection. The result is a higher percentage of the LED’s total output going into the beam rather than being wasted as spill. This is how the M340DF Pro achieves 95,000 candela and a 616-meter beam distance from a bezel under 1.3 inches in diameter. If your primary use case requires positive identification at medium-to-long range rather than area illumination at close range, a Turbo configuration is the correct choice.

The Z68 is SureFire’s shrouded tailcap switch. Light pressure on the rubberized tailcap activates momentary-on — the light is on while pressure is applied, off when released. Fully clicking the cap to the detent position locks the light in constant-on, where it will remain on until clicked off again. The shroud around the tailcap protects against accidental activation when the light is stowed or holstered. The Z68 is SureFire’s standard tailcap for the Scout series and is compatible with SureFire ST07 and RSVP remote switches if you want to add a pressure pad or tape switch.

Yes. The M340DF Pro uses the standard SureFire Scout Pro body and tailcap interface, which is compatible with SureFire remote switches including the ST07 and RSVP series. These remote switches plug into the tailcap body and allow you to activate the light from a pressure pad routed to the forend. This is a common setup for AR-pattern rifles where the shooter prefers to activate the light from a thumb or finger position on the handguard without reaching back to the tailcap.

Lumens measure total light output in all directions — the "bucket" of light a source produces. Candela (or beam intensity) measures how much of that light is concentrated in a focused beam forward. A floodlight can have very high lumens but low candela because its output is spread wide; a spotlight can have moderate lumens but extremely high candela because its output is tightly focused. For a weapon light, candela is typically the more important specification because it determines how far the beam penetrates and how clearly you can identify a target at distance. The M340DF Pro’s 95,000 candela figure is very high for its size class, which is why it achieves a 616-meter beam distance from such a compact head.

Yes. The M340DF Pro ships with an integrated mount that attaches directly to either a Picatinny (1913) rail or an M-LOK slot pattern handguard without a separate adapter. This is a significant convenience over Scout lights that require a separate Scout mount purchased and installed independently. The integrated approach also keeps the overall profile lower, since you are not stacking a light body on top of a rail mount on top of a handguard. If you are running a standard AR-pattern rifle with an M-LOK or Picatinny handguard, no additional hardware is needed — it installs directly.