Collection: 4 Inch LED Light Bars

---

Compact Power. Maximum Versatility. 3,960-7,920 Lumens.

When mounting space is limited but performance cannot be compromised, the 4-inch Pro Series 3.0 delivers professional-grade lighting in the most compact configuration possible. These bars fit where larger lights won't: fog light housings, ATV handlebars, marine T-tops, and tight work truck mounting positions, while producing up to 7,920 lumens of OSRAM-powered illumination. Whether you need amber fog lights for your truck, diffused spreader lights for your boat, or auxiliary work lights for equipment, the 4-inch series proves that compact doesn't mean compromise.

Our veteran-operated company engineers every 4-inch light bar to exceed military standards (MIL-STD-810) with IP69K waterproof protection and top-bin OSRAM and CREE LEDs rated for 50,000+ hours. From construction sites to offshore fishing, these lights perform where others fail, backed by our lifetime warranty.

4 Inch LED Light Bar Buying Guide

Understanding True Compact Performance: Size vs Output

The 4-inch category represents the smallest full light bar configuration, bridging the gap between 2-inch pods and 6-inch bars. Despite their compact dimensions, double row configurations deliver 7,920 lumens, more than most factory headlight systems combined. This makes them ideal for applications where mounting space is restricted but lighting performance remains critical.

Real-world example: A 4 Inch Double Row LED Light Bar produces equivalent lumens to many competitor 6-inch bars while fitting in spaces where larger bars physically cannot mount.

Power efficiency matters: Our Pro Series 3.0 technology delivers maximum lumens per watt, meaning you get professional-grade light output while drawing just 2.4-2.6 amps at 12V, compatible with most vehicle electrical systems without modification.

Beam Pattern Selection: Matching Light to Application

Spot Pattern (30° beam spread) creates focused illumination reaching 400-500 yards, ideal for ditch lights and forward visibility where you need to see far down the trail or road. The concentrated beam penetrates darkness and fog effectively but provides minimal peripheral coverage.

Flood Pattern (120° beam spread) distributes light wide for close-range applications like work lighting, backing up, and camp illumination. The broad spread ensures even coverage across work areas without creating hot spots or dark zones. Perfect for construction LED lights and utility applications.

Diffused Pattern (150° beam spread) provides the widest possible coverage with minimal intensity variation across the beam. Marine spreader lights and reverse lights benefit from this pattern, creating uniform deck illumination or backup visibility without blinding reflection off wet surfaces.

Combo Pattern (60° beam spread) balances spot and flood characteristics with center LEDs in spot configuration surrounded by flood optics. This versatile pattern suits most auxiliary lighting applications where both distance and width matter: fog lights, auxiliary truck lighting, and general-purpose installations.

Application-Specific Sizing Guidance

Fog Light Replacements: The 4-inch single row configuration fits most factory fog light housings on trucks and SUVs. The compact 1.8-inch height maintains low-profile appearance while the 9-inch bracket-to-bracket dimension accommodates standard fog light openings on vehicles like F-150, Silverado, Ram 1500, and Tacoma trucks.

ATV and UTV Mounting: Handlebar and brush guard installations require compact lights that don't interfere with steering or add excessive weight. Single row bars weigh just 1.6 lbs, making them practical for handlebar mounting where every pound matters and wind resistance affects handling.

Marine Spreader Applications: T-top and hardtop mounting on boats benefits from the 4-inch footprint that provides adequate deck coverage without requiring large mounting plates or excessive structural reinforcement. Marine-specific construction with enhanced corrosion resistance survives saltwater environments.

Work Truck Utilities: Tool boxes, bed rails, and equipment mounting positions often have limited clearance. The 4-inch size fits these confined spaces while still delivering 3,960-7,920 lumens of work lighting.

Motorcycle and Adventure Bike: Fork mounting, crash bar installation, and auxiliary lighting brackets on motorcycles accommodate 4-inch bars where larger sizes create wind resistance issues or mounting complications.

Professional & Commercial Applications

Construction and Work Site Lighting

Excavators, bulldozers, and utility vehicles operate in conditions where factory lighting fails. The 4-inch bars mount to roll cages, equipment frames, and work platforms, providing focused task lighting for night operations. IP69K waterproof protection withstands pressure washing and dusty job sites where lesser lights fail within weeks.

Why professionals choose Pro Series 3.0 for construction:

• Vibration resistance: Military-grade testing ensures lights function reliably on heavy equipment operating in rough conditions
• 24V compatibility: 10-30V DC operation works with commercial 24V electrical systems without voltage converters
• Dust protection: IP69K rating prevents particulate intrusion in the dustiest environments

Agriculture and Farm Equipment

Tractors, combines, and utility vehicles benefit from compact auxiliary lighting that supplements factory systems during early morning or late evening operations. The 4-inch configuration mounts to roll bars and equipment frames without interfering with operation or maintenance access.

Farm application advantages:

• Chemical resistance: Ceramic coating protects against fertilizer and pesticide exposure that corrodes unprotected lights
• Temperature range: -40°F to 145°F operation ensures function in extreme seasonal conditions
• Long service life: 50,000+ hour lifespan reduces replacement frequency and maintenance downtime

Marine Commercial Operations

Commercial fishing vessels, charter boats, and work boats require reliable deck illumination for safe operations during pre-dawn departures and after-dark returns. The 4 Inch Marine Spreader Light delivers diffused illumination across work decks while marine-grade construction resists saltwater corrosion.

Commercial marine specifications:

• 316 stainless steel hardware: Prevents galvanic corrosion in saltwater environments
• Ceramic anti-corrosion coating: 360-degree protection extends service life in offshore conditions
• Flush mount options: Low-profile installation minimizes wind resistance and deck obstruction

Security and Emergency Response

Security vehicles, tow trucks, and emergency response equipment utilize 4-inch lights for supplemental scene illumination and vehicle identification. The compact size allows discreet mounting that doesn't compromise vehicle appearance while providing professional-grade lighting when needed.

Security application features:

• Amber lens availability: Provides proper warning light spectrum for emergency vehicle compliance
• Rapid activation: Instant-on LED technology provides full brightness immediately without warm-up delay
• Reliable operation: Lifetime warranty ensures lights function when situations demand dependable performance

Complete 4 Inch Lighting Packages

Fog Light Replacement Package

What's Included:

• 2x 4 Inch Single Row LED Light Bars (combo or amber pattern)
• Adjustable mounting brackets with stainless steel hardware
• Complete wiring harness with relay, inline fuse, and illuminated switch
• Deutsch waterproof connectors
• Detailed installation instructions

Best for: Direct OEM fog light replacement on trucks and SUVs where factory lighting proves inadequate for off-road driving or work applications. Maintains stock appearance while providing 3,960 lumens per light.

Marine Spreader Light System

What's Included:

• 2x 4 Inch Marine Diffused Double Row Lights
• Marine-grade T-top or hardtop mounting brackets
• Tinned copper marine wiring with waterproof connections
• Corrosion-resistant 316 stainless steel hardware
• Ceramic-coated housing for saltwater protection

Best for: Boat deck illumination, fishing operations, and docking assistance requiring wide-spread coverage across work areas. IP69K rating ensures reliability in continuous saltwater exposure.

ATV Handlebar Lighting Kit

What's Included:

• 2x 4 Inch Single Row Spot Pattern Lights
• Handlebar clamp mounts for 7/8" to 1-1/4" bars
• Compact wiring harness with handlebar-mounted switch
• Rubber isolators for vibration dampening
• All stainless steel mounting hardware

Best for: Trail riding applications requiring forward visibility without excessive weight or wind resistance on handlebars. 3,960 lumens per light provides adequate trail illumination for speeds up to 40 mph.

Work Truck Utility Package

What's Included:

• 2x 4 Inch Double Row Flood Pattern Lights
• Universal mounting brackets
• Reverse light integration harness (optional)
• Weather-resistant wiring with independent switching
• Complete installation hardware

Best for: Bed lighting, backup illumination, and work site applications requiring close-range visibility. 7,920 lumens per light creates broad, even work lighting patterns.

Why Choose Black Oak LED Pro Series 3.0 for 4 Inch Applications

Superior Component Quality Over Mass-Market Alternatives

We exclusively specify top-bin OSRAM LEDs from Austria and CREE LEDs from the USA in every Pro Series 3.0 light. Top-bin selection means only the highest efficiency LEDs, those producing maximum lumens per watt with superior color consistency, make it into our products. This represents approximately the highest 10% of LED production, delivering 15-20% more light than standard alternatives while generating less waste heat.

What you get with top-bin LEDs:

• Consistent color temperature: 5000K across all LEDs provides natural white light without color variation between bars
• Maximum efficiency: More light per watt means lower current draw and less heat generation
• Extended lifespan: Premium chips maintain output longer, ensuring 50,000+ hour service life

How we differ: Mass-market competitors purchase standard-bin LEDs to reduce costs. While their lights appear bright initially, output degrades significantly faster and color consistency varies between units. We invest in premium components because we back every light with a lifetime warranty. We cannot afford to use inferior parts.

IP69K Waterproof Protection: The Highest Standard

Most LED light bars claim "waterproof" with IP67 (submersion to 1 meter) or IP68 (continuous submersion) ratings. Our Pro Series 3.0 exceeds both standards with IP69K certification, the highest international waterproof and dust protection rating. IP69K testing includes high-pressure (1450 PSI), high-temperature (176°F) water jets at close range from multiple angles.

Real-world advantage:

• Pressure washing: Clean your vehicle or equipment without worrying about damaging lights
• Submersion: Complete underwater mounting for marine applications without special housings
• Steam cleaning: Industrial and agricultural cleaning equipment won't compromise light function
• Saltwater exposure: Extended offshore use without water intrusion or corrosion damage

Why this matters: A light that fails after one season costs more than a quality light that lasts decades. We see competitors' lights returned after a few months with water intrusion and LED failure. IP69K protection prevents these failures.

Military-Grade Construction Standards

Our engineering team designs every light to meet or exceed MIL-STD-810 environmental testing standards, the same specifications applied to military equipment deployed in combat zones. This includes shock testing, vibration testing, temperature extremes (-40°F to 145°F), and environmental exposure validation.

Testing protocols we apply:

• Vibration testing: Continuous exposure simulating years of off-road use ensures secure mounting and LED integrity
• Shock testing: Impact resistance validates lights survive rough handling and accident damage
• Temperature cycling: Repeated exposure to extreme heat and cold ensures reliable operation regardless of climate
• Salt fog testing: Extended saltwater spray exposure confirms corrosion resistance for marine applications

Results you experience: Lights that function reliably after thousands of hours of off-road abuse, marine exposure, or industrial use while competitors' products fail within the first season.

Lifetime Warranty: Standing Behind Quality

While competitors offer 1-2 year warranties knowing their lights will fail shortly after warranty expiration, we provide a lifetime limited warranty covering manufacturing defects and material failures for as long as you own the product. This isn't marketing. It reflects confidence in engineering and component quality.

What lifetime warranty covers:

• LED failure: Complete light replacement if LEDs fail due to manufacturing defects
• Housing damage: Replacement for corrosion or material failure under normal use conditions
• Electrical failures: Driver circuit and wiring issues covered throughout product life

What this reveals: We cannot afford to warranty inferior products for life. Our lifetime warranty exists because proper engineering and premium components create lights that last decades, not months.

Technical Specifications & Features

Pro Series 3.0 Engineering Details

Beam Pattern Comparison Guide

Construction Materials & Protection

Housing Construction: Military-specification aluminum alloy with DuPont powder coating provides corrosion resistance and impact protection. The housing design incorporates integrated cooling fins that dissipate heat effectively, preventing thermal degradation of LED performance.

Lens Technology: Shatterproof polycarbonate lens with UV protection maintains optical clarity for decades without yellowing or crazing. The lens design incorporates specific beam-shaping optics (spot, flood, diffused, or combo) molded directly into the lens structure.

Mounting Hardware: All mounting brackets use 316 stainless steel hardware, the highest grade stainless available, providing maximum corrosion resistance in saltwater and chemical environments. Adjustable brackets accommodate flat or curved mounting surfaces from 0° to 45° angles.

Ceramic Coating: 360-degree ceramic coating creates a chemical barrier against UV exposure, saltwater, road chemicals, and industrial contaminants. This coating maintains housing integrity and appearance in environments that would corrode unprotected aluminum within months.

Thermal Management: Oversized aluminum heat sinks with integrated cooling fins dissipate heat efficiently, maintaining LED junction temperatures below critical thresholds. Proper thermal management extends LED lifespan and maintains consistent light output during extended operation.

Electrical Specifications

Operating Voltage: 10-30V DC range accommodates both 12V automotive systems and 24V commercial vehicle systems without voltage converters or special wiring. Direct connection to vehicle electrical systems simplifies installation.

Wiring Configuration: 12-foot tinned copper wire with Deutsch waterproof connectors prevents corrosion in harsh environments. Tinned copper resists oxidation that causes connection failure in marine and industrial applications.

Switch Integration: Illuminated rocker switch with weather-resistant housing mounts in dashboard or panel locations. Independent switching allows multiple light circuits without complex wiring.

Relay Protection: 40-amp automotive relay with inline fuse protects vehicle electrical system and light circuits. Relay placement near battery reduces voltage drop and ensures reliable operation.

Installation & Mounting Guidance

Mounting Position Considerations

Fog Light Housing Installation: Measure existing fog light opening before ordering. Most factory fog light housings accommodate 4-inch bars with 9-inch mounting bracket span. Single row configuration maintains low-profile appearance similar to OEM fog lights.

Handlebar Mounting: Ensure handlebar diameter matches clamp range (7/8" to 1-1/4" standard). Position lights outboard of grips to avoid interference with steering lock. Single row bars minimize weight and wind resistance on handlebars.

T-Top and Hardtop Marine Mounting: Locate mounting position that provides deck coverage without creating blind spots. Diffused pattern works best for marine spreader applications. Ensure mounting surface supports light weight and withstands vibration.

Work Truck and Equipment Mounting: Select mounting locations that provide coverage of work areas without interfering with operation. Consider tool box edges, bed rails, and equipment frame positions that allow tool-free light removal for servicing.

Application-Specific Mounting Recommendations

Wiring Best Practices

Wire Routing: Run wiring through existing grommets or create new grommets using proper rubber seals. Route wires away from heat sources (exhaust manifolds, turbochargers) and sharp edges that could damage insulation.

Fuse Placement: Install inline fuse within 18 inches of battery connection to protect wiring in case of short circuit before power reaches relay or switch.

Grounding: Connect ground wire directly to clean, bare metal on vehicle chassis. Remove paint, rust, or coating at ground connection point to ensure reliable electrical connection.

Relay Mounting: Mount relay in protected location away from direct water spray or submersion. Engine bay mounting requires waterproof relay box. Under-hood mounting simplifies wiring but requires protection from water and heat.

Switch Location: Position switch within driver reach but protected from water intrusion. Dashboard mounting provides cleanest installation. Panel mounting requires drilling and proper sealing around switch housing.

Compatibility Verification

12V System Compatibility: Standard automotive electrical systems provide adequate power for up to 4x double row bars (10.4 amps total) without electrical system modification. Larger installations may require alternator capacity verification.

24V System Compatibility: Commercial trucks and heavy equipment with 24V electrical systems operate lights at higher voltage, reducing current draw to 1.2-1.3 amps per double row bar. No special wiring required beyond standard installation.

Battery Capacity: Verify battery can support additional load if installing multiple lights. Typical automotive battery handles 4-6 double row bars without issues. Larger installations benefit from dual battery systems.

Why Black Oak LED 4 Inch Bars Outperform Alternatives

Veteran-Operated Quality Standards

As a veteran-operated company, we apply military-grade quality standards to every product we engineer. We test lights to failure, then engineer solutions that exceed those failure points by significant margins. The result is lighting you can depend on when situations demand reliable performance, whether that's navigating treacherous trails at night, working late on a construction site, or operating offshore fishing equipment before dawn.

Military influence on design: Our testing protocols mirror those used for equipment deployed in hostile environments, ensuring reliability under extreme conditions that would destroy mass-market alternatives. We don't design for average use. We design for the worst conditions you'll encounter.

Domestic Customer Support Excellence

Reach our Florida-based support team at 1-800-348-1287 Monday-Thursday 9AM-5PM, Friday 8AM-3PM EST. Real people who understand the products answer questions, provide technical guidance, and resolve issues. We don't outsource customer service to overseas call centers reading scripts.

Technical assistance available: Our support team includes individuals with installation experience who can guide you through vehicle-specific mounting challenges, electrical integration questions, and performance optimization for your specific application.

30-Day Money-Back Guarantee

Try the lights risk-free for 30 days. If they don't meet your expectations, return them for a full refund. We're confident you'll be impressed with the performance difference between Pro Series 3.0 and competitors' products, but if not, you risk nothing trying them.

Frequently Asked Questions

Are 4-inch LED light bars bright enough for serious off-road use?

Yes. The double row configuration produces 7,920 lumens, comparable to many 10-inch bars from other manufacturers and nearly triple the output of most factory off-road vehicle headlights combined. For auxiliary lighting, ditch lights, and supplemental illumination, 4-inch bars provide adequate brightness. However, for primary off-road racing lighting or extreme high-speed trail riding, consider our 6 inch or 10 inch options for maximum light output.

Which vehicles accept 4-inch bars as direct fog light replacements?

Most trucks and SUVs with factory fog lights accommodate 4-inch single row bars including F-150, F-250, Silverado 1500, Ram 1500, Ram 2500, Tacoma, and 4Runner. The 9-inch mounting bracket span fits most OEM fog light openings, and the 1.8-inch height maintains low-profile appearance. Measure your fog light opening before ordering to confirm fit.

How do 4-inch bars compare to individual LED pods?

The 4-inch bar format provides better heat dissipation through larger housing construction compared to individual 2-inch pods, resulting in longer LED lifespan and more consistent output. Bars also offer integrated mounting brackets and cleaner appearance than multiple pods. However, pods provide more flexible positioning options and work better for locations where the linear bar format doesn't fit.

Can I use LED light bars as primary headlights?

LED light bars are designed for off-road and auxiliary use, not as primary headlights. While our lights produce more than enough lumens for driving visibility, they lack the beam pattern certification required for on-road headlight use. Use light bars as auxiliary lights with headlights, or in off-road and private property applications where DOT certification isn't required.

Do these lights work with both 12V and 24V electrical systems?

Yes. The 10-30V DC operating range accommodates 12V automotive systems and 24V commercial vehicle systems without voltage converters or special wiring. Connect directly to your vehicle's electrical system using the provided wiring harness. This makes them practical for heavy equipment, commercial trucks, and industrial applications alongside standard automotive use.

How difficult is installation for someone with basic mechanical skills?

Most installations take 2-3 hours with basic hand tools. The included wiring harness features color-coded wires, the relay comes pre-wired, and detailed instructions guide you through mounting and electrical connections. If you can mount brackets and connect battery terminals, you can install these lights. For vehicle-specific guidance, call our support team at 1-800-348-1287.

What beam pattern should I choose for fog lights?

Combo pattern works best for fog light applications, providing both forward distance visibility and peripheral coverage. The 60-degree beam spread balances spot and flood characteristics. True amber lens with flood pattern provides proper fog light spectrum for maximum visibility in actual fog conditions, though combo pattern in white offers better all-around performance for most conditions.

How long do these LED light bars last?

Top-bin OSRAM and CREE LEDs with proper thermal management maintain output for 50,000+ hours of operation, approximately 25 years of typical use. The limiting factor is usually mounting bracket corrosion or electrical connection degradation rather than LED failure. Our lifetime warranty ensures replacement if manufacturing defects cause premature failure.

4 Inch vs Other Sizes: Choosing the Right Light Bar

Related Products & Specialized Applications

Looking for even more compact solutions? Our 2-inch LED pods provide pinpoint lighting for applications where 4-inch bars exceed available space. For larger work truck or off-road vehicle applications, explore our 6-inch LED light bars delivering nearly double the output while maintaining compact mounting dimensions.

Need specialized wavelength lighting? Our infrared light bars work with night vision equipment for tactical, security, and wildlife observation applications where visible light would compromise operations.

For vehicle-specific applications, browse our complete collections for Tacoma, F-150, Ram 1500, and 4Runner trucks with mounting solutions designed specifically for these vehicles.

Ready to upgrade your lighting? Call 1-800-348-1287 to speak with a lighting specialist, or explore our complete selection of 4-inch Pro Series 3.0 LED light bars below.

From weekend warriors to daily professionals, Black Oak LED lights the way forward.