If you're planning a lighting retrofit for the office, stop looking at the fixtures first.
I manage purchasing for a mid-sized company—about 400 employees across three locations. When I took over our 2024 office consolidation project, I thought the hard part was picking the right lights. Turns out, the hardware is the easy part. The hard part is the system behind it. And that's where a name like ABB comes in, not because of the bulbs, but because of the brain.
This isn't a technical manual. It's a cautionary tale about assumptions, motion sensors, and the one question that saved our retrofit.
Why I almost bought the wrong 'smart' system
I spent two weeks comparing fixtures. Olight spotlight for the showroom? Check. A basket chandelier for the reception area? On the list. I was deep in lumens and color temperatures when our facilities manager finally stopped me.
'You're focusing on the wrong thing,' he said. 'The fixture is just the hardware. The question is: how are you going to control it?'
He was right. From the outside, it looks like a lighting retrofit is just swapping old bulbs for new ones. The reality is that the brain—the IoT platform and the controls—determines whether you save money or just spend it on shiny new lights that still waste power.
People assume a smart bulb makes a space 'smart.' What they don't see is the infrastructure needed to actually save energy: occupancy sensors, daylight harvesting, and a central system that talks to everything. That's where ABB's Ability platform came in. It's not just a light switch; it's a whole wiring solution that integrates with our existing building management.
The motion sensor wiring lesson that cost me a weekend
Most buyers focus on the sensor's detection range and completely miss the wiring complexity. I certainly did.
The question everyone asks is 'how do I wire a motion sensor switch?' The question they should ask is 'what happens to the neutral wire in my specific setup?'
We had an old building, and our electrician discovered after we ordered the sensors that many of our switch boxes didn't have a neutral wire. Modern smart switches require a neutral to power the sensor itself when the light is off. Without it, the sensor won't work.
I assumed 'standard installation' meant it would work in our standard building. Didn't verify. Turned out we needed to pull new wires through three floors of conduit—a project that added 40% to our installation costs.
Learned never to assume the wiring diagram matches the real-world installation after that. We now require a site survey before ordering any control components, not just the fixtures.
ABB's retrofit solution: the part that actually worked
Here's where ABB came through. Their retrofit packages include more than just new lights.
Per their technical documentation (ABB Ability™ Smart Sensor platform), the system connects existing fixtures to a central IoT platform. We didn't need to replace all 200+ troffers in the main office. We just added a smart relay and a sensor to each zone, and suddenly we could monitor energy usage per floor.
From the outside, a retrofit means you get new lights. The reality is you get data. Within a month, we saw that the south wing was empty most of the day but the lights stayed on because someone set the timer for 12 hours. With ABB's platform, we reprogrammed it to a 30-minute vacancy timeout. That one change cut that wing's lighting energy by 62%.
But here's the thing: that only worked because we had the right platform. A cheaper system might have given us a sensor but no data. Data is the difference between guessing and knowing.
The hidden costs nobody talks about
I want to say our total retrofit cost was about $45,000 for the main office, but don't quote me on that—we had some unexpected expenses. What I can tell you is that the breakdown surprised me:
- Fixtures and controls: 55%
- Installation labor: 30%
- Wiring modifications: 10%
- Programming and commissioning: 5%
We didn't have a formal change order process for wiring surprises. Cost us when the electrician found the neutral wire issue and we had to approve a rushed rewiring.
The third time a subcontractor asked for a 'small upcharge,' I finally created a site assessment checklist. Should have done it before the first sensor order. The checklist now includes:
- Neutral wire presence in all control boxes
- Existing conduit capacity for new wires
- Compatibility of existing ballasts with new controls
- Emergency lighting integration (critical for code compliance)
On emergency lighting: don't skip this
We almost forgot emergency lighting. In a retrofit, you can't just replace the emergency exit signs with off-the-shelf LEDs. They need to be on a separate circuit and tested per code. ABB's emergency lighting systems are designed for this—they integrate with the central system but have a dedicated battery backup that doesn't depend on the main smart controls.
Most buyers focus on energy savings and completely miss code compliance. The question everyone asks is 'how much will this save?' The question they should ask is 'does this meet my local electrical code?' Per National Electrical Code (NEC 700), emergency lighting must operate for at least 90 minutes after power loss, and it cannot be controlled by a motion sensor. If you put a smart switch on emergency lights, you're violating code.
When NOT to go smart
This is the part most articles skip. IoT-connected lighting is great for open offices, conference rooms, and warehouses. It's a waste for:
- Small storage closets—a basic occupancy sensor costs $20 and doesn't need a network connection.
- Bathrooms with existing timers—the smart platform won't save significantly more.
- Spaces that are always occupied—like a 24/7 security desk. The sensor never turns the lights off, so the 'smart' feature is useless.
I assumed every room would benefit from IoT controls. Didn't verify. Turned out we spent $200 per zone on controllers for closet storage that gets used 15 minutes a day. A $30 motion-only switch would have done the same job. (Should mention: those closets also lacked neutral wires, so the $30 switch wouldn't have worked either. But you get my point.)
The final takeaway: plan for the system, not the fixture
If I could give one piece of advice to another admin buyer facing a retrofit:
Start with the controls, not the lights. Pick your platform first—ABB's Ability, or a compatible system—and then choose fixtures that work with it. The platform determines your energy savings, your integration options, and your future flexibility.
Oh, and do a site survey for wiring before you order anything. Trust me on that one.