The Domus TRAK-3 1.5m suspension kit is a suspension set for3-circuit track 1.5m drop, in black orwhite.

Its length field records 100 mm, not 1.5 m

• The record publishes width 100mm, length 100mm, height30mm. Those are the dimensions of the ceiling mounting plate, not the1.5m drop the product is named for.
• THIS IS THE FOURTH SUSPENSION KIT TO DO IT. The fault was first foundin batch 75 across the TRAK-3 suspension range, and it holds here.
• AND IT IS SPECIFIC TO SUSPENSION KITS: the TRAK-3 rod kits record theirlength correctly. That narrowing matters it makes this a suspension-kit faultrather than a TRAK-3 accessories one, and a narrower claim is a moreuseful one.
• SO TAKE THE DROP FROM THE PRODUCT NAME. The dimension fields describe theplate, and on a suspension kit the drop is the specification that matters.

And its datasheet belongs to a different SKU

Our triage flags this product’s sheet as CONTRADICTED and as a familysheet. Its item table names SKUs 2215022153, which are track lengthsrather than this suspension kit. SO THE SHEET DESCRIBES THE TRACK SYSTEM, NOT THISCOMPONENT, and its figures should not be read as this product’s. The general information on it that 3-circuit track mounts to ceiling or wall, installs atany height and carries high power loads is true of the system and usefulcontext. The specifics are not this part’s.

What a suspension kit actually decides

• THE DROP LENGTH IS THE MOST CONSEQUENTIAL DECISION IN A TRACK INSTALLATION, and it ismade before anything is hung.
• TRACK MOUNTED TIGHT TO A HIGH CEILING PUTS THE FITTINGS TOO FAR FROM WHAT THEY LIGHT. Light falls off with the square of distance, so a spotlight at 4m delivers roughly aquarter of what the same fitting delivers at 2m which is why a warehouse-heightceiling needs suspension rather than more fittings.
• 1.5 m IS THE MIDDLE OF THE RANGE. From a 4m ceiling it brings thetrack to 2.5m, which is a working height over a retail floor or a gallerywall. From a 2.7m domestic ceiling it would put the track at 1.2m, which ishead height the 1m or a rod kit is the domestic answer.
• SUSPENSION ALSO INTRODUCES MOVEMENT. A suspended track sways in airmovement in a way a surface-mounted one does not, which matters under a large fan, near a roller door or ina double-height space with convection.

Buy the kit quantity from the track length, not the fitting count

SUSPENSION POINTS ARE SPACED BY THE TRACK’S OWN SPAN AND LOAD, NOT BY HOW MANY LIGHTS AREON IT. A 2m track with two heads and a 2m track with eight need the samesuspension points, because the deflection is a property of the extrusion. As a rule, plan a point near each end and at intervals along the run, and add one wherever ajoint occurs a joint is a hinge, and an unsupported joint is where a track visiblysags. Confirm the spacing with the track’s own load data before orderingquantities. The kit is sold per point, in black or white to match thetrack.

Match the finish to the track, not the ceiling

Black or white. MATCH THE TRACK, BECAUSE THE SUSPENSION READS AS PARTOF IT. A white suspension on a black track is a visible interruption at every point,where the same white suspension against a white ceiling above a white track is nearlyinvisible. The commonest mistake is matching the ceiling instead which works onlywhen the track matches the ceiling too. In a space with a dark exposed soffit, blackthroughout is usually right; in a white gallery, white.

What is published

Where it works

• High ceilings, 3.54.5m brings the track down to work.
• Retail floors and galleries 2.5m working height.
• At joints in a run a joint is a hinge.
• Not on a domestic 2.7m ceiling take a rod kit.
• Not under a large fan or near a roller door it sways.

Specifying it

Suspension kit for TRAK-3 3-circuit track. 1.5m drop. Ceiling plate 100 100 30mm. 220240V. Black or white. Sold per suspension point. 3-year warranty. ITS LENGTH FIELD RECORDS 100 mm ON A 1.5 m KIT those are the ceiling plate’s dimensions, notthe drop the product is named for. This is the fourth suspension kit to do it, and the fault is specific toSUSPENSION kits: the TRAK-3 rod kits record their length correctly, which makes this a suspension-kit faultrather than a “TRAK-3 accessories” one. Take the drop from the product name. AND THE DROP IS THE MOSTCONSEQUENTIAL DECISION IN A TRACK INSTALLATION, because light falls off with the square of distance: aspotlight at 4 m delivers roughly a quarter of what the same fitting delivers at 2 m, which is why ahigh ceiling needs suspension rather than more fittings.

Supplied and supported by Lights For You.

Questions

Is it 1.5m or 100mm?

1.5m. The record publishes width 100mm, length 100mm and height 30mm, and those are the dimensions of the ceiling mounting plate rather than the drop the product is named for. Take the drop from the product name.

Is that a known problem?

Yes this is the fourth suspension kit to do it, first found earlier in this programme. And it is specific to suspension kits: the TRAK-3 rod kits record their length correctly, which makes it a suspension-kit fault rather than a “TRAK-3 accessories” one. A narrower claim is a more useful one.

Can I trust its datasheet?

Not for this product’s specifics. Our triage flags the sheet as contradicted and as a family sheet its item table names SKUs 22150 to 22153, which are track lengths rather than this suspension kit. The general information on it is true of the track system and useful context, but the specifics are not this part’s.

Why does the drop length matter so much?

Because light falls off with the square of the distance. A spotlight at 4m delivers roughly a quarter of what the same fitting delivers at 2m, so track mounted tight to a high ceiling puts the fittings too far from what they light which is why a high ceiling needs suspension rather than more fittings.

Is 1.5m the right drop for me?

It is the middle of the range. From a 4m ceiling it brings the track to 2.5m, which is a working height over a retail floor or a gallery wall. From a 2.7m domestic ceiling it would put the track at 1.2m, which is head height the 1m kit or a rod kit is the domestic answer.

How many do I need?

Suspension points are spaced by the track’s own span and load, not by how many lights are on it a 2m track with two heads and a 2m track with eight need the same points, because the deflection is a property of the extrusion. Plan a point near each end and at intervals along the run, and add one wherever a joint occurs: a joint is a hinge, and an unsupported joint is where a track visibly sags. Confirm the spacing against the track’s load data before ordering quantities.

Black or white?

Match the track, because the suspension reads as part of it. A white suspension on a black track is a visible interruption at every point, where the same white suspension against a white ceiling above a white track is nearly invisible. The commonest mistake is matching the ceiling instead, which works only when the track matches the ceiling too.