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Lumens, beam pattern and reach: choosing auxiliary lights

Auxiliary lights illuminating a desert road at dusk
Illustrative concept image.

Start with the area you need to see

A useful lighting upgrade begins with a specific problem. You may want to see farther along an open trail, illuminate the edges of a campsite, or improve the view immediately beside a vehicle. Those are different jobs. A large output number alone does not tell you which light will solve yours.

Write down where your existing lights fall short before comparing products. Is the gap ahead, to the sides, or close to the vehicle? Also note where the new lights could mount and how you intend to operate them. A light that suits the terrain still needs a compatible mount, suitable electrical connections and an appropriate use case.

Read lumens as total light output

Lumens describe how much visible light a source emits. The abbreviation is “lm,” although Velocity spells out “lumens” in its measurement cards to make the unit easier to read. A listing of 3,400 lumens is an output rating, not a distance or a measure of electrical consumption.

Compare ratings on the same basis. One listing may describe a single lamp while another describes a pair or a complete kit. Manufacturers may also distinguish calculated output from measured output. Check the description and manufacturer documentation before treating two numbers as directly comparable. If the basis is missing, that uncertainty matters more than a small difference between the numbers.

The segmented output bar on Velocity gives a quick visual comparison. It runs from zero to 12,000 lumens, with each segment representing about 500 lumens. The number beneath the bar preserves the listed rating. An arrow identifies output beyond the end of the scale; it does not mean the exact rating has been reduced to the scale maximum.

Match the beam to the task

A spot beam concentrates light into a narrower area. A flood beam spreads light across a wider area. A combination or hybrid design brings narrower and wider distribution together. The exact shape depends on the particular optics, so use the manufacturer’s beam diagram when comparing specific products.

For close work around a parked vehicle, width may be more useful than a concentrated hotspot. For an open route, a narrower beam may help illuminate farther ahead. Mixed terrain can call for a combination. These are starting points for comparison, not a promise that a particular beam will suit every vehicle or riding situation.

Consider how the light will interact with your existing headlights. The goal is a useful field of view rather than simply adding more lamps. Mounting position, aiming and surrounding surfaces all affect the result. A product photograph showing a bright lamp face cannot demonstrate its distribution on the ground.

Separate reach from beam width

When a product provides beam angle and rated reach, Velocity displays a fan-shaped diagram. The angle describes width in degrees. The distance describes the listed reach in metres. Reference rings mark 100, 200 and 300 metres; an arrow indicates reach beyond the chart’s display range.

Treat reach as a specification to investigate, not a guarantee of how far you can safely travel or identify an obstacle. Ask what measurement threshold the manufacturer used and whether competing products use the same method. A distance figure without that context is less useful than it first appears.

The chart combines supplied values into a comparison aid. It is not a photograph of the beam, a prediction of visibility in rain or dust, or a substitute for the product’s own photometric information. When a specification is missing, the store should leave that measurement out rather than manufacture a value.

Check the complete setup

Before ordering, confirm the exact vehicle application, available mounting space, bracket requirements and electrical interface. Find out whether the listing includes the wiring harness, controller, switch and mounting hardware you need. Similar-looking kits can include different components.

For a motorcycle, consider steering movement and the routing of cables near moving parts. For a UTV or ATV, consider existing roof, windshield, rack and protection accessories. Use the instructions for the exact light and mount to check those relationships rather than assuming that a familiar model name guarantees compatibility.

Finally, check the product’s stated intended use and the rules that apply where you operate it. A high output rating or a familiar beam name does not establish road approval. Choose the intended job first, compare specifications on a consistent basis, and confirm the complete installation before purchasing.

Compare light bars and pods, then use our installation planning guide to build your parts list.

Reference: Department of Energy: lumens.