Streamlight ProTac Rail Mount 1L-X USB Weapon Light 850 Lumens – 89027

The Streamlight ProTac Rail Mount 1L-X USB (SKU 89027) is a compact rail-mounted rifle light supplied with the SL-B9 USB rechargeable battery pack and cord, so it runs at its full 850 lumens output and 30,000 candela peak beam intensity for a 346 metre beam straight out of the box. A CR123A lithium cell works as a backup fuel source at 500 lumens.

It uses a simple push-button tail switch, has TEN-TAP programmable mode order, and mounts to MIL-STD-1913 Picatinny rails with an M-LOK mount included. The body is 6000-series black anodised aircraft aluminium, rated IP67 with the tail switch fitted, and measures 4.64 inches.

How It Compares

The same light supplied with a CR123A instead of the rechargeable pack is the Streamlight ProTac Rail Mount 1L-X rifle weapon light. If you need remote pressure-switch capability, the Streamlight ProTac Rail Mount 1L-X USB Pro rifle weapon light adds the Jack-Cap tail cap. Browse all rechargeable rifle and pistol lights, or compare figures in our lumens vs candela chart.

Ideal For

• Night fox and vermin control where a compact rifle light suits a short handguard
• Civilian Service Rifle, straight-pull and 3-Gun carbines used often enough to justify recharging
• Airsoft and training builds wanting a clean tail-switch setup
• Farm and yard work on a carbine or shotgun

Key Features

• 850 lumens output and 30,000 candela peak beam intensity; 346 metre beam
• SL-B9 USB rechargeable pack and cord included
• 500 lumens and 18,000 candela on a CR123A cell as backup fuel
• 100 lumen low with 3,400 candela and a 117 metre beam
• Push-button tail switch; TEN-TAP programmable mode order
• Picatinny fit with M-LOK mount included; IP67 with tail switch

Technical Specifications

UK Delivery & Support

UK-stocked and dispatched tracked from our UK warehouse — no import duties or customs delays — backed by UK-based support and Streamlight's limited lifetime warranty.

Frequently Asked Questions

Is the Streamlight ProTac 1L-X USB rechargeable, and how is it charged?
Yes — the Streamlight ProTac Rail Mount 1L-X USB is supplied with an SL-B9 USB rechargeable battery pack, which charges using the cord included in the box.

What rail does the Streamlight ProTac 1L-X USB fit?
The Streamlight ProTac Rail Mount 1L-X USB fits MIL-STD-1913 Picatinny rails directly, and an M-LOK mount is included for M-LOK handguards.

How bright is the Streamlight ProTac 1L-X USB and how far does it throw?
The Streamlight ProTac Rail Mount 1L-X USB produces 850 lumens output and 30,000 candela peak beam intensity on the SL-B9 pack, giving a beam distance of 346 metres.

What is the difference between the Streamlight ProTac 1L-X USB and the standard 1L-X?
They are the same light: part number 89027 includes the SL-B9 rechargeable pack and USB cord for full 850 lumen output, while part number 89026 ships with a CR123A cell and runs at 500 lumens.