Auxbeam 5D Series 42-Inch Curved LED Light Bar: specs and what to check

The Auxbeam 5D Series is a 42-inch curved LED light bar for 12V vehicles such as trucks, SUVs, ATVs and boats. A bar this long is usually mounted across a roof, windshield frame or bumper to throw a wide band of light on dark trails. Here is what its specs mean.

Brightness and beam

Auxbeam rates the bar at 240W and 24,000 lumens, with a 6500K white colour. A lumen is a measure of total light output, and 6500K is a cool, daylight-like white. The bar uses what Auxbeam calls 5D optical technology, with a dual reflector cup and projector lens, in a spot-flood combo. In general, the spot portion sends light a long way ahead, while the flood portion widens the pattern for the sides. Combining them means one bar does both jobs, with some compromise in each.

Why the curve matters

The bar is curved rather than straight. Auxbeam says the curve fits the vehicle and improves its look. On a roof or windshield mount, a curved bar typically follows the shape of the vehicle and widens the spread of light a little. The listing says the angle can be adjusted freely.

Cooling and sealing

The housing is 6063 die-cast aluminum with a high-transmission polycarbonate lens. Auxbeam says this cools the LEDs effectively, slows light decay and extends the service life to more than 50,000 hours, which is the brand's estimate. The bar conforms to IP68 dust and water standards. Auxbeam also describes breather vents that balance internal and external temperatures to prevent fogging, which suits rain, snow and temperature extremes.

Brackets and installation

The package has two sets of 360-degree rotating metal side brackets, so extra mounting hardware may not be needed. A bar of this length draws significant current, so wiring, relay and fuse choices matter. The listing doesn't detail the wiring, so check the manual for what is included and follow it. A 44.3-inch overall length also means measuring the mounting position carefully.

Who it suits

The bar suits owners of 12V trucks, SUVs, ATVs and boats who want strong, wide auxiliary lighting for night work or trail driving, and who have a mounting location that can take a bar of this length.

What to check before you buy

• Length: the bar is about 44 inches overall. Measure your roof, bumper or rack.
• Voltage: the listing says 12V vehicles.
• Wiring: confirm that you have the harness, relay and fusing you need.
• Local rules: auxiliary lights are typically for off-road use. Check local law.
• Curve and angle: check that the curved shape suits your mount.
• Warranty: Auxbeam lists 24 months and 24-hour online service.

The short version

• A 42-inch curved LED light bar rated at 240W, 24,000 lumens, 6500K.
• Spot-flood combo beam with dual reflector cups and a projector lens.
• 6063 die-cast aluminum housing, IP68 sealing and anti-fog vents.
• Two sets of rotating side brackets included.
• Built for 12V vehicles; confirm length, wiring and local rules.

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