Which Dimming System Should You Specify for Linear Lighting?

Linear lighting lives or dies by its dimming. A continuous run of light across a ceiling is the most visible element in the room, which means any flicker, stepping or mismatch between fixtures is on full display. There is nowhere to hide a badly specified control system when the luminaire is six metres long.

The good news: choosing the right protocol is straightforward once you know what each one actually does. Here is how the options compare, and how to match them to your project.

Why does dimming matter more with linear lighting?

Three reasons.

First, visibility. A linear run draws the eye along its full length, so inconsistent dimming between sections that a downlight grid would disguise becomes immediately obvious.

Second, scale. Longer runs mean multiple drivers working together. The control protocol is what keeps them perfectly in step, and some protocols do this far better than others.

Third, the payoff is bigger. Dimming a space intelligently can cut lighting energy use by up to 60%, extends driver lifespan, and contributes towards BREEAM and WELL credits. On a large linear installation, those savings compound across every metre.

What are your dimming options for linear LED lighting?

In short: DALI for commercial projects that need addressable, scene-based control. Casambi for wireless control without new cabling. 1-10V or 0-10V for simple, budget-friendly analogue dimming. Mains dimming for small spaces with existing dimmer switches. The right answer depends on your space, infrastructure and budget, so let's take each in turn. 

When is DALI the right choice?

DALI gives every luminaire (or every section of a linear run) its own digital address. That means you can control fixtures individually or in groups, build lighting scenes for different times of day, and tie everything into a building management system.

Specify DALI when:

• The project is a workplace, commercial interior or multi-use space
• You need scene setting, occupancy sensing or daylight harvesting
• The building has, or will have, DALI control wiring installed
• Emergency lighting testing needs to run through the same system

The trade-off is commissioning. DALI is a wired protocol that needs professional setup, so it suits new builds and full fit-outs better than light-touch refurbishments. Our Estrella Pro and Flow+ ranges are fully DALI-compatible, which is one reason they appear so often in office specifications.

When does Casambi make more sense?

Casambi turns each luminaire into a node on a Bluetooth mesh network, controlled from an app or wireless wall switch. No control cabling is needed at all, which changes the economics of certain projects entirely.

Specify Casambi when:

• You are retrofitting and cannot (or do not want to) run new control wiring
• The building is listed or heritage and chasing cables into walls is off the table
• The client wants scenes, scheduling and grouping without BMS complexity
• The architectural finish matters and extra wall plates would compromise it

Most of our linear range is Casambi-compatible. On very large sites, plan the mesh layout early, as Bluetooth range between nodes needs consideration across big open floorplates.

What is the difference between 0-10V and 1-10V dimming?

Both are simple analogue protocols that vary a low-voltage control signal, and both are cost-effective and easy to commission. The difference sits at the bottom of the dimming range, and it matters more than it sounds.

With 0-10V, the lights switch fully off when the signal hits zero. With 1-10V, they hold at their minimum brightness instead.

That distinction decides the specification. In a corridor, stairwell, healthcare ward or late-trading retail space, you rarely want a control fault or an over-enthusiastic slider to plunge the space into darkness. 1-10V builds in a floor. In an open-plan office or warehouse where off means off, 0-10V does the job for slightly less.

Is mains dimming still worth specifying?

For the right project, yes. Mains (phase-cut) dimming reduces the voltage from the wall switch directly, so it needs no control infrastructure whatsoever. For small hospitality spaces, meeting rooms or residential-style settings with a handful of fittings, it remains the most economical route.

The caveat is compatibility. Not every dimmer switch plays nicely with every LED driver, and a mismatched pairing is the single most common cause of flicker in linear LED installations. Always confirm the dimmer and driver combination before ordering, and if in doubt, ask us. It is a two-minute check that prevents a very visible problem.

Which protocol suits which project?

Contact our team to discuss your dimming requirements.