Every light bar listing promises more light. What separates one bar from another is what you can check before you buy: how it is sealed, what the spec sheet actually lists, the beam it throws, the size that fits your mount, and the wiring in the box. This guide walks through those checks using Black Oak's Pro Series 3.0 bars as the worked example. They are military grade and IP69K rated, and every number below comes from the product pages. To compare every size and beam pattern in one place, browse the LED light bars collection.
- Sealing: look for an IP69K rating on the spec sheet, the top of the IP scale.
- Size: follow the mount, not the vehicle's name. Measure first with the light bar size guide.
- Beam: combo suits most drivers. Spot (15 degrees) reaches farther, flood (45 degrees) spreads wider.
- Rows: a double row carries twice the LEDs of a single row at the same length. Choose single row when height or clearance is tight.
- Power: check voltage, amp draw and that the harness with fuse, relay and switch is in the box.
- Specs: compare LED count and raw lumens, not just wattage.
What is inside a well-built LED light bar?
Most of what decides how long a light bar lasts is not the LEDs. It is the housing, the seal around the lens, the brackets and the hardware. Here is a Black Oak 20 inch double row Pro Series 3.0, labeled. Numbers 1 to 5 mark parts you can see in the photo.
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Black Oak 20 inch double row LED light bar, Pro Series 3.0. Parts 1 to 5 are visible here; the two extras below are inside or behind the bar.
- Black aluminum housing with a ceramic-coated finish. It carries the LEDs and takes the abuse; the ceramic coating adds UV and corrosion protection.
- Sealed lens and face frame. A Lexan lens in a gasketed housing, rated IP69K against dust and high-pressure, high-temperature water jets.
- Reflectors and LEDs. Osram LED chips, each behind its own reflector. This bar carries two rows of 20, 40 LEDs in total.
- 316 stainless steel brackets. Marine-grade corrosion resistance, so the part that holds the bar does not rust before the bar does.
- Slotted mounting feet. Bolt to a bumper, rack, bull bar or roll cage.
- Not visible: a military-grade breather. It equalizes pressure so moisture does not build up inside a sealed housing.
- Not visible: the wiring harness. A pre-terminated harness with inline fuse, relay and switch comes in the box, with a 2-pin Deutsch connector at the light.
What should I check before I buy an LED light bar?
Tick these off for any bar you are considering. A listing that cannot answer them is asking you to guess.
Which light bar series fits how I use it?
Black Oak builds the same Pro Series 3.0 platform in single row, double row, curved and marine versions. The 20 inch size is the easiest way to compare them, because every series offers it. Figures are from each product page for the 5 watt and 3 watt LED options. Raw lumens are the LED rating, not measured output on the road.
| Series | Best for | 20 inch specs | Shop |
|---|---|---|---|
| Single row | Grilles, low bumper openings, hoods and T-tops where height is tight | 20 LEDs, 100 W or 60 W, 13,200 or 7,500 raw lumens | Single row light bars |
| Double row | Bumpers, racks, bull bars and roll cages with a flat mounting surface | 40 LEDs, 200 W or 120 W, 26,400 or 14,900 raw lumens | 20 inch double row |
| Curved double row | Roofline and windshield mounts that follow a curve | 40 LEDs, 200 W or 120 W, 26,400 or 14,900 raw lumens | Curved light bars |
| Marine | Boat bows, T-tops, towers and anywhere salt water is a fact of life | 40 LEDs, 200 W or 120 W, 26,400 or 14,900 raw lumens | Marine light bars |
Driving on trails or work sites? The off-road light bars and ATV and UTV light bars collections are organized by use. For side coverage that a forward bar misses, see pod lights vs light bars.
How do I pick the size, beam pattern and row count?
Size follows the mount. Measure the surface where the bracket feet will bolt, then compare it with the bar's overall length. The LED light bar size guide has a to-scale chart and recommendations by vehicle, and the mounting locations guide covers the pros and cons of each spot. Shop by length: 10 inch, 20 inch, 30 inch, 40 inch and 50 inch.
Beam follows the driving. Spot concentrates light for distance, flood spreads it for width, and combo mixes both, with spot optics in the center and flood on the ends. Combo is the usual starting point; the combo beam guide explains why, and flood vs spot vs combo compares the three.
Rows follow the space. At the same length, a double row holds twice the LEDs of a single row: 40 against 20 on a 20 inch bar, 60 against 30 on a 30 inch. A single row gives up that output to sit lower and slimmer. If the mount has room for the height, a double row is the stronger spec; if it does not, a single row is built for exactly that spot. The single row vs double row guide compares the two to scale. Browse single row bars or curved double row bars.
Need a different color or a different job? See hunting lights, infrared light bars, fog lights and work light bars.
Pick the size that fits the mount, the beam that fits the driving, and the seal that fits the weather. Everything else is a detail.
What do "military grade" and "IP69K rated" mean on a light bar?
Black Oak light bars are military grade and IP69K rated. IP69K is the top of the IP scale: the housing is rated against dust and against high-pressure, high-temperature water jets, which is why a bar can be pressure washed. "Military grade" is the build behind it: a gasketed, sealed housing, a ceramic-coated finish, 316 stainless steel brackets and a military-grade breather that equalizes pressure so moisture does not collect inside. Those are the parts that decide whether a bar is still sealed after years of salt spray, mud and vibration.
What do owners say?
"Black Oak LED is nothing short of excellent in quality and customer service!"
Travis Nelson, on a 20" 5w double row combo and two 10w LED pods: "I do a whole lot of late night driving on multiple ranches and down many county roads that are heavily populated with deer and hogs. Using these lights have helped me avoid hitting them and have helped spot others when doing surveys on the ranches." More in LED light bar reviews and testimonials.
LED light bar FAQ
What is IP69K?
IP69K is the top rating on the IP scale. It means the housing is rated against dust and high-pressure, high-temperature water jets. Every Black Oak light bar lists IP69K on its spec sheet. The IP codes guide explains the full scale.
Is wattage or lumens a better measure of an LED light bar?
Neither tells the whole story. Wattage is what the bar draws, which matters for planning your wiring. Raw lumens rate the LEDs, so they are the better guide to output, but only when you compare bars with similar LED counts and optics. Check all three: LED count, raw lumens and amp draw.
Should I choose a spot, flood or combo beam?
Combo for most drivers: spot optics in the center for distance and flood on the ends for width. Choose spot if you mostly drive open, fast terrain and want reach. Choose flood for low-speed work and close-range visibility. Black Oak lists 15 degrees for spot and 45 degrees for flood.
Single row or double row light bar?
A double row holds twice the LEDs of a single row at the same length, so it is the stronger spec when the mount has room. A single row is slimmer and lower, which makes it the better fit for grilles, low bumper openings and hoods.
What size light bar fits my vehicle?
It depends on the mount, not the vehicle's name. A 50 inch curved bar is the usual choice for a full-size truck roof, and 20 to 30 inch bars are common at the bumper. The size guide walks through it by vehicle.
What do I need to wire an LED light bar?
Black Oak bars come with a pre-terminated harness that includes an inline fuse, relay and switch, so you need a switched power source, a ground and a safe route for the wire. Use the harness that ships with the bar: its wire gauge and fuse are matched to that bar's amp draw. The how to wire a light bar guide covers the install step by step.
Can I run a Black Oak light bar on a 24 volt system?
Yes. Black Oak light bars list an operating voltage of 12-30V DC, so they run on 12 volt and 24 volt systems.
What is a light bar mainly used for?
Added visibility where factory lights stop. Common uses include a roof or bumper bar for trail driving, a work light on equipment, and a bow or T-top light on a boat. The right place depends on the job; the mounting locations guide compares the options.
Shop LED light bars by size
10 inch double row20 LEDs, 100 W or 60 W
20 inch double row40 LEDs, 200 W or 120 W
20 inch single row20 LEDs, 100 W or 60 W
20 inch marine curved40 LEDs, 200 W or 120 W
30 inch double row60 LEDs, 300 W or 180 W
40 inch curved double row80 LEDs, 400 W or 240 W
50 inch curved double row100 LEDs, 500 W or 300 W
Black Oak LED light bars are designed and engineered in Sarasota, Florida.
