If you searched legrand or legrand occupancy sensor manual, you are probably not here for a design tour. You have a room with lights that stay on, a fixture with no wall switch, or an electrician asking which controls you are going to use. I handle purchasing for a 140-person company, and I have lost more hours than I like to admit to lighting controls.
I'm an office administrator, not an electrician. This is a buyer's guide, not wiring advice. But after buying Legrand products for offices and a warehouse for the past five years, I can tell you one thing: there is no universal recommendation.
The Legrand radiant lighting line includes basic switches, dimmers, occupancy sensors, and Zigbee-enabled controls. They all have a place. The only mistake is choosing one before you understand which problem you are solving.
Three situations, three paths
I split every request into three buckets:
- One light or one room needs a clean, reliable switch or dimmer.
- A room is empty for long stretches, and the lights are left on.
- You want connected, app-controllable, or automatic lighting, and you are willing to set up a gateway.
Start here. It takes thirty seconds and prevents over-ordering.
1. One light, one simple switch
The most common request I hear is about undercabinet LEDs. If you search how to wire a light bar to a switch, the answer starts with another question: is the light bar plug-in or hardwired?
If it is plug-in, the intelligent route is a switched outlet. You don't touch the fixture or the transformer, and you can plug other things into the same outlet later. If it is hardwired, use a standard single-pole switch mounted at the correct height, and put the switch on the hot feed before the driver or fixture. If that sounds simple, that's because people usually get stuck on the wall box and wire gauge, not on the switch itself.
What I tell our team: if you don't know whether the box is rated for the wires you are putting in it, call an electrician. That has nothing to do with whether the switch is good—it does—and everything to do with not learning wiring from an article.
If the fixture is dimmable and you genuinely want dimming, choose the Legrand radiant lighting control that matches the load. The radiant collection makes the wall look intentional because you can combine dimmers, switches, and later a Zigbee device in the same screwless wall plate family.
Do you need a dimmer with Zigbee for a single undercabinet bar? No. If you aren't ready to set up a hub and pair a load, a standard dimmer is not a step backward. It is the right tool.
2. Problem: the light is always left on
If you are tired of finding a conference room or storage area lit at 7 p.m., the solution is not a smart dimmer. It's a sensor. Look for the legrand occupancy sensor manual before you order. The manual should tell you whether the model works for single-pole or 3-way wiring, what loads are compatible, and how the detection pattern is shaped.
Here is the gotcha that got me once: occupancy mode and vacancy mode are not the same.
- Occupancy mode: the sensor sees motion and turns the lights on automatically. It turns them off after the room is empty.
- Vacancy mode: you press the switch on, and the sensor only turns the lights off when no motion is sensed.
Which one should you choose? For a restroom, storage closet, or copy area, occupancy mode makes sense because people's hands are full. For a private office or a conference room, vacancy mode is often less annoying. You still save energy because the sensor shuts the lights off automatically. You just don't give the room the power to turn itself on unexpectedly.
I assumed the word occupancy described a category, not a mode. It didn't cost me much because we caught it before installing a full run, but it cost me a phone call and a reorder. Now I always read the manual section that comes after the wiring diagram, and I double-check before I put a model number on the PO.
3. Connected controls, or what Zigbee actually buys you
Now for the phrase that shows up in product specs: protocolo zigbee—the same protocol in English. Zigbee is an open wireless mesh standard. Unlike a simple Wi-Fi smart plug, it is designed for automation devices that need low power and reliable group communication. That is why you see dimmer zigbee in search results when people want to build a system, not just control one light.
The key advantage of a Zigbee dimmer is the gateway. The dimmer talks to the gateway, and the gateway lets you create schedules, tie an occupancy sensor to a group of lights, or integrate with a building management system. Your phone is not actually controlling the dimmer directly in most setups; the phone talks to the gateway, and the gateway commands the Zigbee network.
Do you need this? Only if you have a specific use: I want every room to follow an occupancy schedule, I want to turn off the lights from my desk when the last person leaves, or this building already runs on Zigbee. If you cannot name a use, don't buy it. A bare Zigbee dimmer without a gateway is just a dimmer with more setup steps.
When I weighed this for our office, the upside was real: no need to run control wiring to every switch. The risk was that I would become the de facto IT support for a system nobody was ready to maintain. I kept asking myself if the benefit was worth the extra moving parts. In the end, we installed Zigbee devices in two places where automatic scheduling mattered, and kept simple controls everywhere else.
How to know which scenario you are in
If you are still on the fence, ask an annoying question: would I be happy with a dumb light switch in this room?
- If yes, buy a simple radiant switch or dimmer.
- If the goal is stopping wasted energy but you don't need remote control, buy an occupancy or vacancy sensor.
- If the goal is automating groups of lights, integrating with another system, or controlling from a phone or schedule, buy Zigbee and a compatible gateway.
And it's okay to test. Our office started with one legrand occupancy sensor manual and two radiant switches before we placed a larger order. A good supplier doesn't treat a small test order as a waste of time. Small projects often grow; the vendor who wants today's tiny order may win tomorrow's bigger one.
Once you know what you are trying to accomplish, choosing the right Legrand product is much easier than searching for the perfect answer. Not because all Legrand controls are the same, but because you no longer need one universal solution.