The SureFire M640DF Scout Light Pro Dual Fuel delivers powerful illumination and unmatched versatility for rifle-mounted lighting systems. Combining the proven performance of the M600DF platform with an enhanced Low-Profile Mount (LPM), this weapon light ensures a secure, streamlined fit on both MIL-STD-1913 (Picatinny) and M-LOK rail systems.
Powered by a recoil-resistant, ultra-high-output LED, the M640DF produces up to 1,500 lumens using the included SF18650 rechargeable battery or 1,200 lumens with two 123A lithium batteries. Its Total Internal Reflection (TIR) lens generates a balanced hybrid beam with strong reach and ample peripheral illumination—ideal for close- to mid-range applications.
Constructed from aerospace-grade aluminum with a Mil-Spec hard-anodized finish and sealed for IPX7 water resistance, the M640DF Scout Light Pro is built for durability, reliability, and professional use in demanding environments.
Key Features
- Up to 1,500 lumens (SF18650) / 1,200 lumens (123A)
- Dual Fuel system: SF18650 rechargeable or two 123A batteries
- TIR lens with hybrid beam (reach + spill)
- Low-Profile Mount compatible with Picatinny & M-LOK rails
- Durable aerospace aluminum construction with Mil-Spec anodized finish
- High-performance LED for consistent, reliable output
- Z68 tailcap for momentary or constant-on activation
- O-ring sealed for weather-resistant performance (IPX7)
Specifications
| High Output | 1,500 lm (SF18650) / 1,200 lm (123A) |
| Runtime | 1.5 hrs (SF18650) / 1.25 hrs (123A) |
| Peak Beam Intensity | 16,000 cd (SF18650) / 12,800 cd (123A) |
| Beam Distance | 250 m (SF18650) / 220 m (123A) |
| Batteries | 1× SF18650 (included) or 2× 123A |
| Switching | Click tailcap (Z68) |
| Length | 5.56 in (14.1 cm) |
| Bezel Diameter | 1.125 in (2.9 cm) |
| Construction | Aluminum |
| Finish | Mil-Spec Hard Anodized |
| Weight | 5.5 oz (156 g) |
| Water Resistance | IPX7 |
Compatibility
The SureFire M640DF Scout Light Pro Dual Fuel is designed for:
- Rifles and carbines with MIL-STD-1913 (Picatinny) rails
- Platforms with M-LOK mounting systems
- Use with SureFire remote switches and accessories
- Tactical and professional weapon light setups
Why Choose the SureFire M640DF Scout Light Pro?
- High-output performance: Up to 1,500 lumens for powerful illumination
- Flexible power options: Rechargeable or disposable battery compatibility
- Balanced beam profile: Ideal for both distance and situational awareness
- Secure mounting system: Low-profile design for improved weapon handling
- Built for reliability: Engineered for harsh tactical environments
Comparison: M640DF vs Standard Weapon Lights
| Feature | M640DF Scout Light Pro | Standard Weapon Lights |
| Max Output | Up to 1,500 lumens | Lower output |
| Power Options | Dual fuel (rechargeable + disposable) | Single battery type |
| Beam Type | Hybrid beam (reach + spill) | Limited beam versatility |
| Best Use | Tactical, duty, and professional use | General illumination |
FAQs
How bright is the M640DF Scout Light Pro?
It delivers up to 1,500 lumens with the SF18650 battery and 1,200 lumens with 123A batteries.
What batteries does it use?
It supports one SF18650 rechargeable battery (included) or two 123A lithium batteries.
Is it compatible with M-LOK and Picatinny rails?
Yes, the Low-Profile Mount supports both M-LOK and MIL-STD-1913 rail systems.
What type of beam does it produce?
It uses a TIR lens to create a balanced beam with both reach and peripheral illumination.
Is it waterproof?
Yes, it is rated IPX7, allowing submersion up to 1 meter for 30 minutes.
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