Open Plan Lighting Zones: Planning Guide | MOSS

Open plan lighting zones are the working unit of any interior that has given up its internal walls. When one floorplate has to hold cooking, eating, working and sitting, the ceiling is the only plane left that can tell a person where one activity ends and the next begins. Pendant luminaires do that work, and the decisions that make it succeed are taken at plan stage, well before a fixture is selected.

This guide sets out how MOSS Objects approaches zoning in open interiors: how many zones a plan can reasonably carry, what scale each one needs, how colour temperature behaves when several luminaires share a single sightline, and what the ceiling has to know before the specification is issued.

What Open Plan Lighting Zones Actually Do

A zone is not a fixture. It is a defined pool of light with a purpose, and the object that produces it is only the visible part. In a plan with walls, the room does the defining and the luminaire simply fills it. In an open plan that relationship reverses. Nothing else in the volume marks the boundary, so the luminaire becomes the instrument that draws it.

Three things follow from that. The first is anchoring: a pendant fixes furniture in place, and furniture that sits outside its pool of light reads as provisional. The second is hierarchy. A room where every area is lit to the same level has no centre, and an open plan without a centre reads as a corridor with furniture in it. The third is evening behaviour. Most open interiors are used in parts rather than as a whole, and zoning is what allows two thirds of the floorplate to go quiet while one area stays in use.

The most common failure is not a badly chosen fixture. It is even distribution: a regular grid across the whole ceiling, with a decorative pendant added over the table afterwards. The grid removes the contrast that zoning depends on, and the pendant then has nothing left to do except be seen. A zoned plan works the other way round. It accepts that parts of the ceiling will carry nothing at all.

Reading the Plan Before Choosing the Luminaire

Zoning starts from the furniture plan, not from the ceiling. The fixed anchors are the ones that cannot move later: the dining table, the kitchen island, the primary seating group. Everything else is negotiable, and the luminaires that serve the negotiable areas should be specified last.

Sightlines come next. In an open interior a pendant is seen from every position in the room, not only from the chair beneath it. A composition that resolves beautifully over a table can sit directly in the view from the entrance to a window, or cut the line between the kitchen and the seating area. Two or three standing positions, drawn on the plan with eye height marked, will settle most of these questions before a model is chosen.

Then the ceiling itself. Open plans frequently combine a normal ceiling with a double height portion, and a luminaire that suits one can look lost in the other. Structure matters just as much: joist direction, beam positions and slab type determine where a canopy can actually land. This is worth establishing early, because canopy requirements differ by collection. An Emily Group of Seven suspends seven shades from a single canopy of Ø 140 mm × H 50 mm, because the waxed oak frame carries the composition. Dune uses a canopy of Ø 190 mm × H 50 mm in every size, with a second canopy from sixteen shades upwards. Charlotte sits on a linear canopy of 1020 × 84 × 46 mm, which needs a straight run of ceiling to work against.

Scale and Spacing Across Zones

Scale is measured against the furniture a luminaire serves, not against the room. Over a dining table, a luminaire reading as roughly two thirds of the table length holds the surface without crowding the people at its ends. Over an island the same logic applies to the worktop. Ceiling height changes the suspension height, not the size of the object.

Between zones the question is hierarchy. One zone should carry the largest and most articulated object in the interior, and the others should visibly recede from it. Repeating the same model at the same size in two zones produces a lighting scheme rather than a room: the eye reads a system and stops looking. Modular families are useful here, because a single vocabulary can be scaled per zone. Dune runs from four to twenty shades, Emily from a single shade to a group of thirteen, and both hold their identity across that whole range.

Spacing is the part most often compressed. Zones read as separate only when there is unlit ceiling between them, and the working minimum is roughly the diagonal of the smaller of the two zones. Where a plan cannot afford that distance, the better answer is usually fewer zones rather than tighter ones. Two well separated pools of light will describe a space more clearly than four that overlap at the edges.

Suspension height is part of the same calculation. A pendant hung low over a table reinforces that zone and shortens the sightline across the room, while the same object hung higher lets the eye pass beneath it and ties the zones together. In an open plan both readings are legitimate, so the height should be chosen for the effect it produces across the whole floorplate rather than copied from a rule written for a single closed room.

Colour Temperature Across an Open Sightline

Walls hide colour temperature differences. An open plan does not. Once several luminaires are visible at once, a shift of a few hundred kelvin that would pass unnoticed between two rooms becomes the first thing a person sees, and it tends to read as an error rather than a decision.

The MOSS collections are not uniform in this respect, which is worth knowing at specification stage. Dune uses integrated LEDs at 2700 K, each module at 2.1 W and 260 lm, so a Dune 12 Curve delivers 5720 lm at 46.2 W. Kosmos runs at 3000 K, at 3.6 W and 568 lm per LED. Charlotte is 3000 K with a CRI of 98 and 12240 lm across four quartz glass tubes. Emily takes E27 lamps at 220 V for Europe and Asia, or E26 at 120 V for the USA and Canada, up to 20 W, so the colour temperature of an Emily zone is chosen by the specifier.

The practical consequence is straightforward. If a Dune and a Kosmos share one sightline, 2700 K sits next to 3000 K. That can be a deliberate move, warmer over the table and more neutral over the island, and it works well when it is planned. It belongs on the drawing as a decision rather than arriving as a surprise on site. Where Emily sits alongside either collection, matching the lamp to the neighbouring luminaire keeps the sightline consistent. Control follows the same logic: zones used independently belong on separate circuits, Charlotte is supplied dimmable, and dimming for Dune and Kosmos is set with the driver specified for the project.

Ceiling Coordination and the Specification

Canopy positions have to be fixed before the ceiling is closed, and for objects with more than one canopy the reflected ceiling plan should carry the canopy centres rather than the centre of the luminaire. The figures are worth writing into the drawing directly. Emily I and II and the groups from three to thirteen shades use one canopy of Ø 140 mm × H 50 mm. Emily V6 to V12 use one canopy of Ø 200 mm × H 50 mm. Dune uses Ø 190 mm × H 50 mm in every size and configuration, with two canopies for sixteen and twenty shades. Kosmos uses Ø 150 mm × H 35 mm, one canopy for the 4S and 4L, two for the 6S and 6L. Charlotte uses its linear canopy of 1020 × 84 × 46 mm.

Cable is 300 cm (118 in) as standard across the collections. Emily V10 and V12 are supplied with 400 cm (157 in), and longer cable is available on request where a double height zone calls for it. Suspension height is set on site, so the drawing should state the intended height from finished floor rather than a cable length. Where a zone sits under a sloped or vaulted ceiling, giving the angle as well saves a round of queries, because it changes the fixing detail.

Programme is the last coordination point. Emily, Dune and Kosmos carry a lead time of 8–12 weeks and Charlotte 12–16 weeks, and all collections are CE marked with UL available on request. In a phased fit out those figures decide the order in which zones are specified. Issuing the largest or most heavily customised zone first is usually what keeps the rest of the programme intact.

Configurations, finishes and canopy data for every model are listed on the MOSS Objects collection pages.

For a zoning study on a specific plan, including suggested models per zone and canopy positions for the reflected ceiling plan, contact MOSS Objects directly.