The overwhelming majority of buildings that will exist in 2035 have already been built. If smart lighting is going to make a meaningful dent in energy consumption and occupant experience, it has to work in spaces designed for nothing smarter than a wall switch. Retrofit is not a compromise — it is the primary use case.

Why retrofit makes sense before replacing everything

The instinct for a full re-specification is understandable. Start fresh, specify correctly from the beginning, avoid the mess of existing infrastructure. But for most occupied buildings — offices, hotels, retail stores, hospitals — a full rip-and-replace is not a realistic option. Tenants can't vacate for three months. Landlords won't approve structural works. Capital budgets don't stretch to new fixtures when the existing ones are perfectly functional.

Retrofit works differently. You identify what's already installed, determine what can be upgraded in place, and replace only the components that need to change to enable smart control. In most cases, the fixture itself stays. The wiring stays. What changes is what sits between the power supply and the LED load: the driver.

For a Casambi retrofit, this is particularly clean. Casambi intelligence lives in the driver. Replace the driver, and the fixture becomes smart — no new wiring, no new conduit, no new fixtures.

What can actually be retrofitted

LED panels and downlights with conventional drivers

The most common retrofit scenario in Indian commercial buildings today: LED fixtures installed 3–7 years ago with basic on/off or non-dimmable drivers. The fixtures themselves are fine — the problem is they have no dimming, no scheduling, and no sensor integration. The retrofit is straightforward: open the fixture, swap the existing driver for a Casambi-enabled driver of the same wattage class, and the fixture is now on the mesh.

The key constraint is physical space. Casambi drivers are compact, but not all fixture back-boxes will accommodate a replacement unit of different dimensions. Measure before you specify.

Existing DALI infrastructure

Buildings with legacy DALI installations — typically 2015-era commercial fit-outs — are excellent retrofit candidates. The DALI control cable is already run, the drivers are already addressable, and the infrastructure is in good condition. What's often missing is a usable front end: the original DALI controller is outdated, the programming interface is inaccessible, or the system has simply been abandoned because it was too complex to manage.

A Casambi DALI gateway can sit on top of the existing DALI bus and provide a modern Bluetooth mesh interface to the entire installation. Drivers don't need to change. Wiring doesn't need to change. Occupants get a smartphone app and battery-powered scene controllers. The upgrade is entirely in the control layer.

Fluorescent fixtures

Fluorescent retrofit is a separate discipline. In most cases, the lamp and gear tray need to come out and be replaced with an LED module and Casambi driver. The fixture body and wiring stay. This is more involved than a driver swap but still significantly cheaper and faster than replacing the whole fitting, and avoids the waste of a functional luminaire chassis.

Wall switches

In a wired control system, every switch needs a control cable run. In a Casambi retrofit, switches are battery-powered and wireless — they pair to the mesh and control any combination of drivers in any zone configuration. Existing wall switch boxes can often be repurposed as mounting points, with the new battery-powered switch sitting in the same location as the old wired one. No electrician needed for the switch work.

The survey: what to map before you specify

A good retrofit survey is the difference between a project that runs smoothly and one that generates expensive surprises on site. At minimum, document:

When to retrofit vs. replace: If the fixture is structurally sound, aesthetically appropriate, and less than 8 years old — retrofit the driver. If the fixture is failing, outdated in appearance, or the existing LED module is incompatible with any available smart driver — replace the fitting. The driver swap is always cheaper; the question is whether it's appropriate.

The commissioning difference

Traditional wired smart lighting systems require commissioning by a trained technician with access to proprietary software. DALI addresses need to be assigned, bus topology verified, scenes programmed, and the whole thing tested floor by floor before handover. This is skilled work, and it takes time — typically days for a medium-sized floor.

Casambi commissioning is done through a standard smartphone app, with no proprietary hardware required. Devices are discovered automatically when powered up, named in the app, grouped into zones, and assigned to scenes — all in real time, with the result visible immediately. A single person can commission a floor of 40 fixtures in a morning. Changes after handover don't require a technician — the facilities manager or building owner can adjust scenes and schedules from their phone.

For retrofit projects in occupied buildings, this matters enormously. Commissioning can happen after hours, one zone at a time, without disrupting the rest of the building. There is no single point in the project where the entire floor needs to be powered down and offline.

Common retrofit challenges and how to address them

Non-standard driver footprints

Some fixtures — particularly low-cost LED panels — have drivers integrated into the fixture body in a way that makes swap-out difficult. In these cases, the options are: use an external driver mounted in the ceiling void above the fixture, or replace the fixture. External mounting adds a small amount of wiring work but is often faster than a full replacement.

Mixed driver types on one circuit

Older buildings often have a mix of driver technologies on the same circuit — some constant current, some constant voltage, some non-dimmable. A Casambi network handles this gracefully: devices of different types can coexist on the same mesh, grouped and controlled independently. The mixing is a documentation problem, not a technical one — the survey needs to capture it accurately so the right driver is specified for each fixture.

Landlord and facility manager approvals

In multi-tenant buildings, the landlord or facilities manager often has approval rights over any electrical work. A Casambi retrofit is easier to get through this process than most alternatives: you are replacing like-for-like (a driver with a driver), the work is contained within the fixture, and there are no new penetrations or surface modifications. A clear scope document showing exactly what changes and what doesn't is usually sufficient.

A real-world example: office floor in Bandra Kurla Complex

A 6,000 sq ft open-plan office floor in BKC had 120 LED panel fixtures installed during the original fit-out in 2019. The panels were good quality and in fine condition, but had non-dimmable drivers and no occupancy sensing. Energy bills were high because lights ran at full power from 8am to 10pm regardless of occupancy.

The retrofit: 120 driver swaps to Casambi constant-current drivers, 8 wireless occupancy sensors mounted to existing ceiling grids, and 12 battery-powered scene controllers at key points (entry, meeting rooms, breakout areas). No new wiring. No fixture changes. Commissioning completed in two days out of hours.

The result: occupancy-based dimming reduced lighting energy consumption by 38% in the first quarter. The scene controllers allowed the facilities team to set presentation mode in meeting rooms without calling an electrician. The total project cost was a fraction of what a full refurbishment would have required.

Getting started

A retrofit begins with an accurate survey. If you have drawings and a fixture schedule, we can give you a preliminary driver specification and ballpark cost from that. If you don't, a site visit is the starting point — we can map what's installed and what the upgrade path looks like. Get in touch and we'll take it from there.