Replace the switch itself, so the room still works by hand — if your wiring allows it.
A smart switch replaces the physical switch on the wall. That is the whole appeal: the room keeps working exactly as everyone expects, a guest can turn the light on without an app, and the light stays reachable by automation because the switch never actually cuts power to a smart bulb. It is the grown-up answer to the problem that makes people give up on smart bulbs.
It is also the category where wiring decides everything. The critical question is whether your switch box contains a neutral wire — the return conductor that completes the circuit. Modern installations usually have one. Many older European boxes carry only live and switched-live, which means a smart switch has no way to power itself when the light is off. Some models work without a neutral by drawing a tiny trickle of current through the lamp, which works well with older bulbs and can cause faint flickering or glowing with low-power LEDs.
Two practical details catch people out. Several brands sell the switch mechanism without a faceplate, on the assumption you will reuse the existing one, so the advertised price is not the final price. And because these are mains-powered, Zigbee and Z-Wave models act as routers that strengthen your mesh — a genuine bonus of choosing switches over bulbs.
What to look for
Neutral wire, or not
Open the existing switch and look. Three wires with a blue (neutral) present means you can use anything. Two wires means you need a specifically no-neutral model, and should expect to test for flicker with your particular bulbs.
Number of gangs
A “gang” is one button position in a faceplate. A single-gang switch controls one light; two- and three-gang units control two or three from the same plate. Count what you are replacing before ordering.
Dimming type
Trailing edge (also called reverse phase) dimming suits almost all modern LEDs and is the setting to look for. Leading edge (forward phase) was designed for incandescent and halogen bulbs and can buzz or flicker with LEDs. Better switches let you choose.
Load capacity
Dimmers are rated in watts for the total lamp load, typically 120–600 W. LEDs draw so little that this is rarely a limit — but a very small load can be a problem, because some dimmers need a minimum wattage to regulate properly.
Faceplate compatibility
In Europe, plates follow brand systems such as JUNG or Busch-Jaeger. If you are replacing one switch in a room full of matching plates, check the model accepts them, or budget for replacing the lot.
Extras worth having
Energy metering feeds your energy dashboard. A settable minimum brightness fixes bulbs that flicker at the bottom of the range. And on some models the physical terminals can be disconnected so the buttons become pure automation triggers rather than controlling the circuit directly.
The shortlist compared
Brand
Model
Protocol
Dimmer
Works with no neutral
Metering
Indicative price
Shelly
Wall Switch (holder + module)
Wi-Fi
Yes
No
Yes
€7 + module
Sonoff
SwitchMan M5
Matter over Wi-Fi
No
No
No
€18
Zemismart
ZMS-206 Display Switch
Zigbee
No
No
No
€30
ION Industries
LED Dimmer
Zigbee
Yes
In practice, usually
No
€39
Aqara
Dimmer Switch H2
Zigbee or Thread
Yes
Yes
Yes
€50
KlikAanKlikUit
Rotary Dimmer MAWD-250
Matter
Yes
Yes
No
€53
Fibaro
Walli Dimmer
Z-Wave
Yes
Yes
Yes
€60
Sunricher
Wall Dimmer
Zigbee or Z-Wave
Yes
No
Yes
€65
EcoDim
LED Dimmer Switch
Z-Wave, Zigbee or Matter
Yes
Yes
Yes
€70
Niko
Double Switch
Zigbee
No
No
No
€89
Qubino
Luxy Smart Switch
Z-Wave
No
No
No
€99
Prices move constantly and vary by country, so we give an indicative band
rather than a figure that would be stale within a month. Check the brand's own store for the
current price.
The picks in detail
Aqara Dimmer Switch H2
Zigbee or Matter over Thread
This is the most capable switch here for the money, and the one to reach for in an older house. It works without a neutral wire, supports both dimming methods so it can be matched to awkward bulbs, and genuinely dims smoothly from 1% rather than jumping to 10%.
One important quirk: it is dual-protocol, and the Matter / Thread path exposes fewer settings than the Zigbee path — you lose the dial sensitivity and minimum/maximum brightness controls. If you need those, pair it over Zigbee.
Works without a neutral wire
Flicker-free 1–100% dimming to 200 W of LED
Both forward and reverse phase dimming
Built-in energy metering
Over Thread you lose dial sensitivity and minimum/maximum dim settings
Fibaro Walli Dimmer
Z-Wave
The Walli is the reliable premium Z-Wave option, and unusually flexible about what it can dim. Press the top or bottom of the paddle to dim, and the coloured LED strip shows how much power the circuit is drawing.
If you are dimming a single low-wattage LED you will probably need the Fibaro Bypass 2, a small component wired at the fitting that gives a no-neutral dimmer enough current to behave. Budget for it rather than being surprised.
Works without a neutral
Acts as a Z-Wave router
LED indicator visualises live power draw
Handles incandescent, halogen, fluorescent and LED
Low-power LEDs need the separate Fibaro Bypass 2
EcoDim LED Dimmer Switch
Z-Wave, Zigbee or Matter
Dutch-built and the choice of a lot of installers, EcoDim ships the mechanism only, deliberately, so it disappears behind the plates already on your wall. That is a real advantage when you are retrofitting one switch in a room. It is available in Z-Wave, Zigbee and now Matter versions — note the Matter variant needs a Matter-capable hub rather than working through a bridge.
Excellent build quality
Reuses your existing faceplate
Energy metering in your dashboard
Overload and overheat protection
Among the priciest here
Ships without a faceplate
KlikAanKlikUit Rotary Dimmer MAWD-250
Matter
A genuinely useful hybrid: it speaks Matter to your hub while still accepting the old 433 MHz remotes many Dutch homes already have in a drawer. Three dimming modes — trailing edge, leading edge and a dedicated LED filament profile — make it one of the more adaptable dimmers for decorative bulbs, which are notoriously fussy.
Matter plus legacy 433 MHz remote support
No proprietary bridge
Three dimming modes including LED filament
Fits two- or three-wire boxes
Faceplates cost extra
Shelly Wall Switch
Wi-Fi
Worth understanding what this actually is: not a smart switch, but a plate and button assembly designed to press a Shelly relay or dimmer module hidden in the box behind it. Add a Shelly 1PM, Plus 1PM, 1L or Dimmer 2 and you have a complete solution for very little money. It is the budget route, and the looks reflect that.
Extremely cheap as a holder
Tidies up in-box wiring
Wide choice of Shelly modules behind it
Not a switch on its own — you must buy a Shelly module too
Dated appearance
Sonoff SwitchMan M5
Matter over Wi-Fi
The cheapest way to put Matter switches throughout a house, provided your boxes have neutrals. Multi-way support means it handles the common case of two switches controlling one light. Restore-state and timed “inching” behaviour have to be configured in Sonoff’s own app first, after which your hub takes over.
A statement piece rather than a workhorse: a glass touch panel whose ambient backlight doubles as a night light and whose five zones can each trigger something different. Note the limitation buried in the specification — the light it is wired to can only be toggled, not dimmed, which is an odd omission at this price.
Glass touch panel with five touch zones
16-million-colour backlight usable as a night light
Z-Wave router
Can also drive water heaters, fans and infrared panels
The attached ceiling light can only be switched, not dimmed
Very expensive
Switch, module, or button?
There are three ways to make a light switch smart, and the right answer depends on whether you
care how the wall looks.
A smart wall switch replaces the visible switch. Best appearance, but you are
committed to that brand’s design language in every room you do it.
An in-wall module (a relay or dimmer hidden in the box) keeps your existing
switch and plate entirely. Nothing changes visually, which is ideal in a period property or a
rental you cannot alter. It needs space in the box, which older shallow boxes may not have.
A wireless battery button replaces the switch mechanism with something that only
sends signals. Nothing is wired, so it can go anywhere — including where there was never a
switch — but the circuit is then permanently live, which is exactly what
smart bulbs want.
Mains wiring is not a beginner job. In many countries replacing a fixed switch is
legally work for a qualified electrician, and an incorrectly wired dimmer can overheat. If you are
not certain which wire is the neutral, that uncertainty is itself the answer — get someone in.
In-wall modules and battery buttons avoid the issue entirely.
Turn off the circuit at the breaker, unscrew the existing switch and count the conductors. Live and switched-live only (commonly two wires, often both brown or black) means no neutral. A third wire, usually blue in modern European wiring, is the neutral. If in any doubt, ask an electrician — guessing here risks damaging the switch or the bulbs.
Why do my LEDs flicker or glow faintly with a smart dimmer?
Almost always because the dimmer works without a neutral and draws a small trickle of current through the lamp to power itself. Modern LEDs need so little power that this trickle is enough to make them glimmer. The fix is a bypass component fitted at the light (Fibaro sells the Bypass 2 for this), a higher combined lamp wattage, or a dimmer that has a neutral connection.
What is the difference between leading edge and trailing edge dimming?
Both work by cutting part of the alternating-current waveform, but at opposite ends. Leading edge (forward phase) was designed for incandescent and halogen lamps and often buzzes with LEDs. Trailing edge (reverse phase) is smoother and quieter and is what you want for almost all modern LED lighting.
Do smart switches improve my network?
Zigbee and Z-Wave ones do. Because they are permanently mains powered, they act as routers that relay traffic for battery-powered sensors, extending range and reliability. Wi-Fi and Matter-over-Wi-Fi switches do not contribute to a mesh.
Is a switch better than a smart bulb?
For any room with more than one or two fittings, usually yes — one switch controls the whole circuit for less than the cost of five bulbs, and the room still works by hand. Bulbs win where you want colour, or where you cannot or may not alter the wiring.
Terms explained
Neutral wire
The return conductor that completes an electrical circuit. Smart switches need a power source even when the light is off, which is why a neutral in the switch box makes life much easier; two-wire boxes require special no-neutral models.
Gang
The number of separate button positions in one switch plate. A two-gang switch controls two circuits from a single faceplate.
Trailing edge dimming (reverse phase)
A dimming method that cuts the tail of each AC half-cycle. It is quieter and smoother with LED lamps than leading edge dimming, which was designed for filament bulbs.
Bypass
A small component wired at the light fitting that gives a no-neutral dimmer a path for the small current it needs, curing flicker and faint glowing with low-wattage LEDs.
Multi-way circuit
A wiring arrangement where two or more switches control the same light, such as at the top and bottom of a staircase. Not every smart switch supports it.
