We may earn a commission if you buy through our links. Details.
Who this is for
Anyone adding a light bar or a set of pods to a vehicle for trail, farm or work use, who is not sure what size to get or how to wire it.
Measure first
The bar has to fit where you mount it, so start with a tape measure, not a catalog. Measure the flat part of the bumper, the opening in the grille, or the crossbars on the roof rack. Then subtract a little for the brackets on each end.
Most bumper and grille bars land somewhere between 20 and 32 inches. Roof bars run longer, often 40 to 52 inches. A bar that is too long for the spot ends up hanging past the edge or blocking airflow to the radiator, so go a size down if you are between two.
Common sizes
A 20 to 26 inch bar is the usual pick for a bumper or behind the grille. The Nilight 26 inch triple row bar is one example. It is a Budget Pick, and Nilight lists it at 540 watts.
A 30 to 37 inch bar works on wider bumpers and some roof racks. The Nilight 37 inch bar is listed at 780 watts. This is also a Budget Pick.
If you only need light close in front or off to the sides, small pods are often better than a bar. Pods mount on the A-pillar, the bumper or a ditch light bracket. Examples are the Nilight 4 inch pods (Budget Pick) and the 3 inch amber pods (Budget Pick).
Spot, Flood or Combo
A spot beam throws a narrow beam a long way down the road or trail. A flood beam spreads light wide and short, which is what you want for work around the vehicle or slow trail driving. A combo bar has both, usually spots in the middle and floods on the ends.
For most people a combo is the safe bet. If you already have a bar out front, a pair of flood pods for the sides fills in what the bar misses.
About the Watt Numbers
Take the listed watts with a grain of salt, on any brand. Watts tell you how much power the bar draws, not how much usable light hits the ground. Optics, heat sinking and beam pattern matter as much as the number on the box. Compare bars by beam type and size first.
Wiring and Switches
Run the bar through a relay and a fuse, not straight off a switch. Most bars and pod kits come with a harness that has both. If yours does not, a harness like the Nilight 12 AWG harness (Budget Pick) covers one bar or one pair of pods.
If you plan to add more than two or three lights, a switch panel keeps the dash clean. The Nilight 6-gang panel (Budget Pick) runs up to six accessories and has USB ports and a voltmeter.
Street Use
Most light bars are sold for off-road use only. Many states do not allow them on while driving on public roads, and some want them covered. Check your state rules before you wire one to come on with your high beams.
Where Bars Usually Go
| Spot | Usual size | Notes |
|---|---|---|
| Behind the grille | 20 to 30 in | Measure the opening. Watch radiator airflow. |
| Front bumper | 20 to 32 in | Easiest wiring. Can block a factory sensor or plate. |
| Roof rack or roof mount | 40 to 52 in | Can cause glare off the hood and wind noise. |
| A-pillar or ditch mount | 2 to 4 in pods | Good for side light on slow trails. |
Parts to Look At
These are examples for this topic, not rankings. Confirm fitment for your vehicle on each product page.
Nilight Budget Pick
26" Triple Row Spot/Flood LED Light Bar
Part # 812227031985
Fits: Universal, not made for a specific vehicle
Source: Nilight product listing, checked Oct 21
- Length 26 in
- Beam Spot/flood combo
- Listed power 540 W
OEDRO Budget Pick
22" Quad Row LED Light Bar with Wiring Harness
Part # OEBO-0032
Fits: Universal, not made for a specific vehicle
Source: OEDRO product listing, checked Oct 21
- Length 22 in
- Listed power 520 W
- Includes Wiring harness
Nilight Budget Pick
37" Triple Row Spot/Flood LED Light Bar
Part # 812227031992
Fits: Universal, not made for a specific vehicle
Source: Nilight product listing, checked Oct 21
- Length 37 in
- Beam Spot/flood combo
- Listed power 780 W
Nilight Budget Pick
4" Triple Row Spot/Flood LED Pods (2 Pairs)
Part # 812227032234
Fits: Universal, not made for a specific vehicle
Source: Nilight product listing, checked Oct 21
- Size 4 in
- Count 4 pods
- Beam Spot/flood combo
Nilight Budget Pick
3" Amber DRL Flood LED Pods (Pair)
Part # 840323908221
Fits: Universal, not made for a specific vehicle
Source: Nilight product listing, checked Oct 21
- Size 3 in
- Beam Flood
- Wiring 18 AWG, DT connector
Nilight Budget Pick
12 AWG Wiring Harness, 1 Lead, with Switch
Part # 727196414670
Fits: Universal, not made for a specific vehicle
Source: Nilight product listing, checked Oct 21
- Wire 12 AWG
- Leads 1
- Includes Switch, 3 fuses, 2 spade connectors
Nilight Budget Pick
6-Gang Rocker Switch Panel with USB-C and Voltmeter
Part # 840323910071
Fits: Universal, not made for a specific vehicle
Source: Nilight product listing, checked Oct 21
- Switches 6 on/off rocker
- Extras USB-C PD, USB, voltmeter
- Housing Aluminum
Keep reading
Gotchas
- Measure the mount before you pick a length.
- Check that the bar does not cover a parking sensor, camera or radar unit.
- Use a fused relay harness.
- Off-road lights are usually not legal to run on public roads. Check your state.
Sources
- Nilight product listings for the bars, pods, harness and switch panel linked above (checked 2026-10-28).
- General wiring and mounting practice.
Specs and fitment can change. We re-check guides on a schedule and when readers report errors. Last reviewed 2026-10-28. Report an error.
FAQ
Do I need a relay for a light bar?
Yes. A relay lets the switch handle a small current while the bar pulls its power straight from the battery through a fuse. Most bar kits include one.
Is a bigger light bar always better?
No. A bar that fits the spot and has the right beam does more than a long bar that glares off the hood.