How to Choose a Magnetic Track Lighting System

Magnetic track lighting looks almost too simple from below. A slim rail, a few heads, light where you want it. The awkward part is that most of what decides whether a system works sits above the ceiling line, where nobody looks at the brochure stage. So this guide goes in the order we'd actually make the calls on a project, and your quote request should come out of it half answered.

Four of those calls are structural: rail voltage, slot width, how the profile meets the ceiling, and which fixture families each run must carry. Smart control is the fifth. It's also the one people try to settle first, and that's usually backwards.

Start with the ceiling, not the catalogue

Here's a trap that's easy to fall into. Say you find a spotlight you love, save the picture, and build the whole scheme around it. Then it turns out that head belongs to a track family the ceiling can't take.

A magnetic head only fits the rail it was designed for. That's the whole problem in one line.

So look up before you open any catalogue. Is the plaster already finished and painted? Then you're almost certainly surface mounting, rail screwed straight on, nothing cut. Is the ceiling still open, joists showing? Now recessing is on the table, with only the slot visible once it's boarded. A double-height room or an exposed concrete soffit is a different case again, and often the answer there is a suspended run on cables or rods, which brings the light down toward the people actually using the space.

Then measure the void. Properly, with a tape, not from the drawings. A shallow void knocks out some recessed profiles before anyone has said the word "voltage", and it's far cheaper to learn that now than when a profile arrives and won't sit flush.

Write it down: finished or open, height, void depth. Three facts. They'll cut the options faster than any product photo will.

Voltage: mains-direct or 48V

This is the first real fork. Sampo's magnetic range comes in two families and they're wired differently.

The high-voltage pair, M25 and M35, takes mains straight onto the rail. Rated input is 95–260V. No external transformer, nothing to size, no box hidden somewhere above the plaster, so the install stays close to what any electrician already does for a ceiling fitting.

The 48V family puts a driver between the mains and the track. The rail itself only carries low voltage, which lowers the touch risk when a run sits within reach, over a mezzanine or along shelving people dig into every day. It's also where the slimmest profiles live. The catch is the driver. It needs a home, some air, and an access panel someone can open in five years' time. In a ceiling that's already closed, finding that spot can take longer than choosing the fixtures.

Neither family wins in the abstract. Long shop runs with big display heads lean mains-direct. A low apartment ceiling where the client wants the line to nearly disappear leans 48V. If you're stuck between them, our 48V versus 220V comparison goes through the trade-offs in more detail, driver placement included.

One side note. The heads are LED either way, and the lighting industry does publish shared interface specs for LED modules and their electronics through the Zhaga Consortium. Useful background. It doesn't make magnetic adaptors interchangeable, though; those stay tied to their own track family, and we confirm fit series by series.

Slot width decides how big the heads can be

Within high voltage, it's about the slot.

M25 has a 25mm slot and takes smaller fixtures. Think living rooms, bedrooms, a compact studio: homes and light-duty rooms, mostly. It comes in two electrical builds, a smart WiFi variant and a non-smart EMC variant, which matters later when we get to control.

M35 opens the slot to 35mm so it can carry larger heads. Shops, museums and offices tend to need that because they're lighting from further away, over longer runs, often onto merchandise or exhibits that have to read clearly. The 4-wire smart build is the common choice on M35.

The 48V side is less about slot and more about profile. The 20mm system is the everyday one for a normal ceiling. The 26mm ultra-thin profile is aimed at low ceilings and rooms that drop the main light altogether, and it has right-angle and rounded corner pieces. Those corners deserve attention early. If a recessed loop turns four times, the turns get fixed on the drawing before the plasterer arrives, not improvised on site. Past those two there's an ultra-thin light-strip (belt) system, where the track itself reads as one continuous glowing line, and a semi-flexible track for runs that follow a curve.

All six sit side by side in the series index if you want to compare them directly.

What the track is made of

The profiles are extruded aluminium. Brass conductor strips run along inside the slot, separated from the body by a flame-retardant PVC insulator. Finish is baked paint, black or white.

Why care? Because the rail is the bit you won't replace. Heads get swapped as displays change or a room gets rearranged; the profile stays in the ceiling for years. A rigid body keeps a long run straight instead of sagging between fixings, and the finish has to sit comfortably against the ceiling colour, since you'll be looking at that line every day with the lights off.

Lengths are worth checking before anyone draws a cut list. Depending on the model, track is made in 1.0, 1.5, 2.0 and 3.0 m. Not every model comes in every length, so we check your runs against what actually exists before we quote. It saves a surprising number of short offcuts and awkward joins.

Decide what each run has to do

One rail can do several jobs. That's the point of magnetic track, and it's also how schemes go wrong, because people pick heads before they've said what the run is for.

So name the job first. Is this run lighting the art on one wall? Giving the whole room soft general light? Washing a bookcase evenly from top shelf to bottom? Or just drawing one clean line down a corridor?

Then the fixture family more or less follows. Magnetic spotlights do accent work, a tight pool on a painting, a shelf, a dining table. Grille lights put several small optics in one bar, which gives more even light with better glare control. Flood or linear fill lights provide general light from the track itself, and that's how a room without a central fitting still feels lit. Linear lights draw a bar of light along the run. Wall washers spread light evenly up a vertical surface.

Watch the geometry too. A run can look perfect on plan and still graze a canvas at a bad angle once it's built, because the rail ended up too close to the wall. Distance from the wall matters as much as which head goes on it.

And here's a mismatch worth checking before anything else: fixture ranges differ between M25, M35 and the 48V profiles. A grille light or wall washer on one series doesn't guarantee the same family exists on another. Check the family is available on the series you've chosen before the ceiling is built around it. If the building mixes room types, the applications page shows which series usually suits living spaces, corridors, shops, galleries and offices.

A small habit worth keeping: label spare heads and replacement parts by series. Two years on, nobody remembers whether the hallway was M25 or 20mm.

Smart control: confirm it head by head

Smart is where specs most often run ahead of what's actually installed.

Some of Sampo's magnetic fixture categories support WiFi, remote or gateway control, with dimming and adjustable colour temperature. Some don't. The track build also has to match: put a smart head on a non-smart build and it won't behave like part of a smart system, however good the app looks.

That's why deciding "it'll be smart" on day one causes trouble. It quietly locks in a track build before anyone has listed the fixtures, and then half the heads on the wishlist turn out to be in categories without the feature. Decide control after the fixture list exists, not before.

If the building already runs a lighting control protocol, mention it in your first message. A project tied into an existing DALI network is a very different conversation from a homeowner who wants app control on a phone; the DALI Alliance covers the protocol itself. We'll tell you which heads on your list support which route, and anything we can't confirm gets marked unconfirmed rather than assumed. The conditions are set out on our smart control page.

And honestly, if nobody's going to use app control, dimming or scenes, skip it. A non-smart build has fewer parts to set up, and the budget can go on the fixtures instead.

If you're buying for resale or a brand

Distributors and brands go through the same voltage and slot choices. Then there's a second layer on top: what needs to change for their market.

A custom magnetic series usually moves along a few axes. Light output, CCT, CRI and beam angle can be set per fixture. Voltage family, colour, finish and material can change, and so can rail length and wire count. Housings and parts can follow your drawing or sample, with private-label packaging on top.

What you won't find here are minimum order quantities, sample times, lead times or warranty terms. They depend on how much of the product changes and on volume, so we confirm them in writing per project. Certification works the same way: it belongs to specific models, not to the range as a whole. The OEM and ODM page explains how a custom project gets started.

Before you ask for a price

You don't need a finished lighting design to get a useful answer. You do need the right few facts. Without the void depth, the run lengths, or what the run is meant to do, a quote can't get far.

• The ceiling: finished or open, rough height, how deep the void is.
• Voltage preference, or why you can't decide yet.
• Approximate run lengths, and where corners or curves fall.
• The job of each run: accent, fill, wash or line.
• Control: app, remote, gateway, or none.
• Trade buyers: target market, and whether private-label packaging is needed.

If there's a 48V driver involved, tell us where you think it could go. Even "no idea yet" is useful.

Still sketching the room? Start with the layout guide; picking a system gets much easier once you can see where the runs go. When you're ready, send whatever you have through the enquiry form and we'll come back with a suggested series and the fixture families that fit it.