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Klarus GL4 Rail-Mounted Light – 3300 Lumens, USB-C

$104.99

Built for real-world use
✓ Free shipping on all orders
✓ 30-day hassle-free returns
✓ Warranty on every product
✓ Ships fast from the US

  • 3300 lumens max brightness with 747 ft beam throw
  • Built for real-world use with tough, durable construction
  • IPX8 waterproof, USB-C rechargeable, up to 375 hours of runtime
  • Professional-grade cable pressure switch for remote activation

FAQS
  • How bright is the Klarus GL4?
    The GL4 delivers up to 3300 lumens for maximum visibility in low-light environments.
  • How is the light controlled?
    It uses a remote pressure switch system that allows fast activation and mode control without changing grip.
  • How long does the battery last?
    Runtime can reach up to 375 hours on lower output settings, depending on usage.
  • Is the GL4 built for harsh conditions?
    Yes. It is designed with durable materials to withstand demanding environments.
  • What mounting systems does it support?
    The GL4 is designed for standard rail-mounted applications.

Full Specifications

Model: GL4
Maximum Output: 3300 lumens
Runtime: Up to 375 hours on low mode
Output Levels: Turbo 3300 lumens, High 1200 lumens, Medium 200 lumens, Low 10 lumens, Strobe 3300 lumens
Runtime by Mode: Turbo 4 hours, High 7 hours, Medium 13.5 hours, Low 375 hours
Candela: Up to 34240 cd
Beam Distance: Up to 1213 ft
Beam Distance by Mode: Turbo 1213 ft, High 656 ft, Medium 262 ft, Low 65 ft Control System: Remote pressure switch with cable control
Mounting: Rail mounted design
Construction: Rugged, durable build for extreme conditions
Battery: 1 x 21700
Working Voltage: 2.8 to 4.2V
Charging: 5V 2A
Drop Resistance: 4.92 ft
Water Resistance: IPX8 rated for up to 30 minutes submerged at 6.5 ft
Dimensions: 5.5 in x 1.18 in x 1.06 in
Weight: 5.3 oz without battery
Warranty: 5 years

Best Uses & Real-World Applications

  • Rail-mounted tactical lighting
    High-output illumination for equipment-mounted applications requiring maximum brightness.
  • Professional & duty use
    Designed for extended operations where reliable lighting and remote control are critical.
  • Outdoor & low-light operations
    Strong beam output for navigation, search, and situational awareness in dark environments.
  • Emergency & preparedness
    Long runtime and powerful output for sustained use during critical situations.

Shipping Info

Orders typically ship within 24 hours (excluding holidays)

Description

For the user who wants maximum-output rail-mounted lighting in extreme environments. The Klarus GL4 delivers 3,300 lumens of high-output illumination — the brightness ceiling in the rail-mounted category — with USB-C charging and a long-life battery for sustained use.

✓ Authorized Klarus dealer ✓ Ships from Florida in 24 hours ✓ Free shipping on orders $49+

Klarus GL4 High-Output Rail-Mounted Light

Extreme Brightness for Demanding Environments

The GL4 delivers 3,300 lumens — top-of-class output for rail-mounted lighting. The high-output configuration is built for users who need to overpower ambient light, identify targets at long distances, or maintain illumination through windshield glass.

Tactical Switch Operation

  • Tail-control activation — fast, intuitive operation
  • Multiple output modes — turbo, high, medium, low
  • Strobe — disorientation and signaling
  • Lockout — prevents accidental activation

USB-C Rechargeable

USB-C charging from any standard cable. Long-life integrated battery delivers extended runtime even at high output levels.

Tool-Free Picatinny Mounting

Quick-attach mounting and removal from standard Picatinny rails in seconds, without tools.

Built for Hard Use

Aircraft-grade aluminum body, hard-anodized matte finish, water-resistant rating, and impact-resistant construction. Built for the conditions where 3,300 lumens actually matter.

Who the GL4 Is For

The GL4 is built for users who need maximum output in a rail-mounted platform — duty professionals, range users, hunters working long distances, and prepared citizens who value top-tier capability.

Backed by Klarus's manufacturer warranty and our simple 30-day return policy.

Frequently asked questions

Is this a genuine product with a valid warranty?

Yes. We are an authorized dealer for Klarus and TrustFire, so every light we ship is genuine and carries the full manufacturer warranty, handled by us. Flashlights bought through unauthorized or grey-market sellers are usually not covered.

How fast do you ship, and what does it cost?

Orders placed on business days leave our Port Charlotte, Florida warehouse within 24 hours. Shipping is free on US orders over $49. We hold our own stock, so if the site shows it in stock, it is on a shelf here.

What is your return policy?

Returns are accepted within 30 days through a simple return process. See our refund policy for full details, or email us first if you are unsure whether a light is the right one and we will help you decide before you buy.

How many lumens do I actually need?

More than most people expect to hear: usually fewer than you think. 200 to 500 lumens covers everyday tasks, 500 to 1,500 covers work and duty use, and above that you are buying reach rather than usable working light. Runtime drops sharply at maximum output on every light ever made.

What is the difference between lumens and beam distance?

Lumens measure total light output. Candela measures beam intensity, and that is what determines how far a light throws. A tightly focused 1,000-lumen thrower will out-distance a 3,000-lumen floodlight, which is why reflector design matters as much as the headline number.

Which battery does it take, and do you sell spares?

Most of our lights use a built-in or removable lithium-ion cell such as a 14500, 16340, 18650, 21700 or 26650. The size is listed in the product specifications. We stock protected cells in all of those sizes plus a multi-chemistry charger, so you can keep a charged spare ready.

Can you help me choose between two models?

Yes, and we would rather do that than have you return something. Email Customersupport@brightlightled.shop or call 941-273-3209, Monday to Friday 8am to 5pm EST, with the two models and how you plan to use the light.

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