Kits run from four lights to forty-eight, and the honest answer to "how many do I need" is that most people need fewer than the big kits and more than four. What actually decides it is where the lights go and what you want lit — so this guide works from placement outward, rather than telling you to buy the largest package.
The short version
- 4 lights — one in each wheel well. Tyres and the ground immediately around them.
- 8 lights — wheel wells, plus one at the front, one at the rear and two along the belly. The first count that lights the whole vehicle rather than four spots under it.
- 12 to 16 — closes the dark gaps between the wheels, or doubles up the wells for density.
- 24 — three per wheel well, eight along the belly, two front and two rear. A continuous underglow with no gaps.
- 32 and 48 — long-wheelbase trucks, multi-vehicle builds and show cars.
Eight is the count most UTV builds should start at. Four looks sparse from the side; eight reads as a lit vehicle.
Start with placement, not with a number
Every rock light does one of four jobs, and the order you fill them in is what makes a count sensible.
- Wheel wells. The original job. Lights the tyre and the ground it is about to be on, which is the part of the terrain that actually matters when you are picking a line. Four wells, so the first four lights go here.
- Front and rear. The nose and tail are the two places a gap is most visible from outside the vehicle, and the two places you most want ground light when you are approaching an obstacle or backing off one.
- The belly. The long dark stretch between the front and rear wheels. This is what turns four bright spots into a lit machine, and it is the difference most people notice first in photos.
- Density. Additional lights per well, or a tighter belly spacing. This is where you stop adding coverage and start adding intensity and pattern resolution.
Follow that order and the counts fall out on their own.
Count by count
4 lights — focused coverage
One in each wheel well. This is the starting configuration, and it is the right one if what you want is functional light on the tyres and a bit of colour, on a short machine, on a budget.
What it does not do is light the vehicle. From the side there is a lit patch at each corner and a long shadow between them.
8 lights — full-vehicle coverage
One in each wheel well, two along the belly, one at the front and one at the rear. This is the count we would point most UTV owners at. It is the first configuration where the whole underside is lit rather than four spots, and it is the point at which patterns start to read as movement travelling along the vehicle rather than four lights changing colour together.
12 lights — expanded coverage
Two per wheel well, two along the belly, one front and one rear. Noticeably brighter at the corners than eight, with the same belly coverage.
If your priority is closing the side gap rather than brightening the wells, tell us — the same twelve lights spread as four wells plus eight belly is a different-looking machine, and which one is right depends on your wheelbase.
16 lights — long machines and full-size trucks
Where a longer wheelbase makes an eight-light belly spacing look thin. On a four-seat UTV or a crew-cab truck, sixteen is roughly where eight sits on a two-seater.
24 lights — continuous underglow
Three per wheel well, eight along the belly, two at the front and two at the rear. This is a continuous band with no visible gap, and it is the configuration where travelling patterns look like one animation crossing the vehicle rather than a sequence of lights taking turns.
32 and 48 lights
These exist and they sell, mostly for long-wheelbase trucks, trailers, boats, multi-vehicle jobs and show builds where the goal is coverage from every angle. If you are considering one, call us rather than ordering it — at that scale wiring and power layout matter more than the light count.
Spacing, in one rule
The gap between lights is what decides whether the underside reads as lit or as spotted. Aim for spacing where the pools of light from two adjacent lights meet on the ground rather than leaving a dark band between them. On a low, wide machine that is a wider spacing than on something tall — the higher the light, the wider its pool.
Which is also why "how many lights" is a worse question than "how long is your vehicle and how high is the mounting point". Two machines with the same number of lights can look completely different.
Wiring is what actually caps the count
This is the part that surprises people, and it works differently on our two platforms.
- Topology
- Diamond RGBEach light runs back to a splitter, and the splitters run to the controller
- Axion RGB+WLights link one to the next along the vehicle
- What that needs
- Diamond RGBSplitters in 2, 4, 6 and 8-way, plus an extension per light
- Axion RGB+WAn extension per light — each light ships with either a 6 ft or a 12 ft cable, and we set the mixture for your layout
- Power on long runs
- Diamond RGBA boost board, one per 16 rock lights
- Axion RGB+WPower injected every three lights, on each physical run
- Sold as
- Diamond RGBKits from 4 to 48 pieces, plus a single
- Axion RGB+WSold each — a kit is a quantity plus a controller
Two things worth spelling out:
Power injection is per run, not per total. Eight Axion lights split three, three and two across the driver side, passenger side and centre needs three injection points, not the two you would get by dividing eight by three. The builder works this out from the layout.
There is no published maximum number of Axion lights on one controller. Our configurator stops at 24 because that is where the diagram stops being legible and where the wiring requirements stop being something we are willing to sell unattended — not because the controller runs out. Above that, it is a conversation.
Current: the number that actually adds up
An Axion rock light draws a measured 1.4 A at 14.3 V on our bench, which derives to 20 W. Current does add, so a run of eight is about 11 A and a run of sixteen is about 22 A. Size the supply and the wiring for that, and check what else is on the circuit.
We have no measured current figure for Diamond RGB — it has not been on our bench, and we would rather say that than publish an estimate. If you are planning a large Diamond system, ask us for the load rather than reading it off a listing.
What does not add is brightness. Sixteen lights are not four times as bright as four, they are spread over four times as much vehicle. Illuminance is a reading at a point, and pointing more lights at different places does not multiply it.
Pick the system before you pick the count
Rock lights come in two Rhino platforms, and they are separate lighting systems with separate controllers that do not sync with each other.
- Diamond RGB carries 24 individually addressable RGB LEDs in a directional grid, in a CNC-machined 6061-T6 billet housing filled with hardened clear resin, rated IP69K. That LED density is what makes detailed travelling patterns legible — it is not a brightness figure. It is on the RGB system with Rhino 2.0 and 2.5 whips, halos, RGB strip, Connex and RhinoLink.
- Axion RGB+W uses high-output Cree RGBW packages, each carrying a dedicated white die alongside red, green and blue, so white comes from its own channel rather than from mixing. Also CNC-machined 6061-T6, rated IP69K. It is on the RGB+W system with Rhino 3.0 whips and RGB+W strip.
Do not choose between them on emitter count. Twenty-four small addressable LEDs and a few large RGBW packages are different architectures built for different jobs, and neither number is a measurement of output.
The practical recommendation
- Two-seat UTV, first system: start at 8.
- Four-seat UTV or full-size truck: start at 12 to 16.
- You mostly want colour and presence: spend the budget on belly coverage before you double up the wheel wells.
- You mostly want to see the ground: spend it on the wheel wells and the nose.
- You plan to expand later: pick the system first, wire the run for where the extra lights will go, and add them when you are ready. Both platforms are designed to be added to.