SureFire M640DF Scout Light Pro

The SureFire M640DF Scout Light Pro is SureFire's flood-oriented weapon light, delivering 1,500 lumens with 16,000 candela through a TIR (Total Internal Reflection) lens that produces a characteristically smooth, even beam. Where the Turbo variant concentrates light into a tight throw beam, the M640DF spreads it wide for maximum peripheral illumination. This makes it the best choice in SureFire's lineup for CQB, room clearing, and indoor home defense.

The dual-fuel design accepts either a SureFire SF18650B rechargeable battery for 1.5 hours of runtime or two CR123A lithium primaries for backup. At 5.0 ounces, the M640DF is the lightest premium weapon light in this comparison. The aerospace-grade aluminum body with Mil-Spec hard anodizing meets IPX7 water resistance and handles the punishment of hard-use carbines including sustained rapid fire.

SureFire's Scout mount interface is the industry standard. Arisaka, Haley Strategic, Unity Tactical, and dozens of other companies make inline, offset, and pic rail mounts for Scout bodies. The SR07 and UE-SR07 switches have equally broad third-party support for cable management and mounting solutions. No other weapon light has this depth of ecosystem, which is a real advantage when configuring a specific handguard and rail setup.