Light bar

Also called LED light bar, off road light bar, bar light

A light bar is a long housing holding a row of LED emitters, sold and mounted as one unit, and its shape is a packaging decision rather than an optical one.

What is a light bar?

Anything from six inches to fifty, holding anywhere from two to sixty LEDs behind a single lens or a row of individual reflectors. Curved ones follow the line of a roof; straight ones sit on a bumper or above a windscreen. Combo bars mix a tight pattern in the centre with wide ones at the ends.

The alternative is pods: two or more separate lamps, each with its own optic and its own mount. The choice between them is mostly about control.

Bar or pods?

A bar is one wiring run, one mount, one switch and a lot of output for the money. That is a real advantage and it is why they sell.

Pods let you aim each lamp separately, run different beam patterns for different jobs, put them at different heights, and switch them independently. That last one matters more than it sounds: the fix for glare in dust is turning off the lamp that is causing it, and a combo bar makes that all or nothing.

Where the format causes trouble

The classic light bar position is on the roof or across the top of the windscreen, and a wide beam up there is the one combination that reliably makes visibility worse in dust, fog and snow. Bars are also long, which means the mount is long, which means wind noise and often a rattling roof at highway speed.

None of that makes a bar wrong. It makes the position and the pattern the questions worth asking before the length is.