Garden Last updated · owner ratings verified July 2026
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Side by side
| Our pick Lutron Lutron Caseta Original Smart Dimmer Best overall $50-70 Check price | Lutron Lutron Diva LED+ Best value $20-28 Check price | Lutron Lutron Maestro LED+ Best for multi-location $25-35 Check price | Kasa Kasa Smart Dimmer Switch HS220 Cheapest smart option $18-25 Check price | Kasa Kasa Smart Light Bulbs (color, dimmable) No wiring at all $25-40 for 4 Check price | |
|---|---|---|---|---|---|
| What owners rate it | |||||
| Owner rating | 4.7 / 5 (5,647) | 4.6 / 5 (5,747) | 4.6 / 5 (5,316) | 4.6 / 5 (34,878) | 4.4 / 5 (11,492) |
| Specifications | |||||
| How you control it | App, voice, wall paddle, Pico remote | Wall paddle and slider only | Wall tap and hold, plus companion switches | App, voice, wall paddle | App, voice, bulb only |
| Hub required | Lutron Smart Bridge required for app and voice | None | None | None — connects direct to 2.4GHz Wi-Fi | None — connects direct to 2.4GHz Wi-Fi |
| Neutral wire needed | Not required | Not required | Not required | Required | Not applicable — no wiring |
| Single-pole or 3-way | Single-pole or 3-way | Single-pole or 3-way | Single-pole or multi-location | Single-pole only | Not applicable |
| Load rating | 150W LED/CFL, 600W incandescent | 150W LED/CFL, 600W incandescent | 150W LED/CFL, 600W incandescent | 150W LED/CFL, 300W incandescent | 9W per bulb, 800 lumens |
| LED low-end tuning | Adjustable low-end trim | Adjustable low-end trim | Adjustable low-end trim | Calibration routine in the app | Dimming handled in the bulb driver |
| Wireless protocol | Clear Connect RF, not Wi-Fi | None — wired only | None — wired only | 2.4GHz Wi-Fi | 2.4GHz Wi-Fi |
| Works with | Alexa, Google Home, Apple Home, SmartThings | Nothing; it is a manual dimmer | Nothing; it is a manual dimmer | Alexa, Google Home, IFTTT | Alexa, Google Home |
| Who it suits | |||||
| Best for | Smart dimming in an older box with no neutral wire | A plain, excellent dimmer that never needs an app or an account | A hallway or stairwell dimmed from two or three places | App and voice dimming on a modern circuit, for the price of a manual Lutron | A rented apartment, or a box with no neutral where you still want smart dimming |
Ratings are aggregated Amazon owner ratings, not our own testing. Figures verified July 2026.
Pros and cons
Lutron Caseta Original Smart Dimmer
- Works with no neutral wire, which is the single reason it fits houses where Kasa cannot
- Runs on Lutron’s own Clear Connect radio rather than your Wi-Fi, so it does not drop off when the router reboots
- Highest owner rating of any dimmer on this page, across a substantial review base
- Handles single-pole or 3-way, and pairs with the battery-powered Pico remote so a second switch needs no wiring
- Needs the Lutron Smart Bridge for app and voice control — buy a kit that includes it or budget separately
- Most expensive dimmer here by a wide margin
- The paddle is small and the design is dated compared with Kasa’s
Lutron Diva LED+
- Adjustable low-end trim on the back is what stops cheap LEDs flickering or dropping out at the bottom of the range
- No neutral required, so it drops into almost any existing switch box
- Large paddle with a separate slider — you can turn the light on at your set brightness without hunting for it
- Very large owner-review base at a strong rating for a product with no smart features at all
- No app, no voice, no schedules — it is a dimmer and nothing else
- Two-gang installs need the side sections snapped off, which is fiddly and permanent
- Rated for 150W of LED, which is generous but not unlimited on a big fixture bank
Lutron Maestro LED+
- Supports true multi-location dimming with companion switches, so brightness is adjustable at every point
- Tap to turn on and off, press and hold to dim — owners consistently prefer this to a slider in the dark
- Adjustable low-end trim, same as the Diva, which is the feature that solves LED flicker
- Delayed fade-to-off gives you time to leave the room before the light goes out
- Costs more than the Diva for what most single-switch rooms will never use
- Companion switches are sold separately and are easy to forget when ordering
- No app or voice control despite looking more modern than the Diva
Kasa Smart Dimmer Switch HS220
- By far the largest owner-review base on this page, which makes its rating the most reliable number here
- Wi-Fi is built in, so there is no hub to buy, power or place
- Costs roughly a third of the Caseta while doing most of the same everyday jobs
- Schedules, away mode, gradual fade-on and gradual fade-off are all included with no subscription
- Requires a neutral wire — in older homes this alone rules it out, and there is no workaround
- Single-pole only, so it cannot go on a 3-way circuit at all
- Owners consistently report occasional Wi-Fi dropouts needing an app or breaker reset, which the Lutron radio does not suffer
Kasa Smart Light Bulbs (color, dimmable)
- Dims at the bulb, so there is no wiring, no breaker and no landlord conversation
- Adds color and color temperature, which no dimmer switch on this page can do at any price
- Large owner-review base and the cheapest route to smart lighting in a room with a few fixtures
- Works around the neutral-wire problem entirely, which is the main reason to consider it here
- The wall switch must stay on or the bulbs lose power and go offline — a real household friction point
- Cost scales per bulb, so a six-bulb kitchen is more expensive than one Caseta dimmer
- Does not work with existing fixtures you like that take unusual bulbs, and cannot dim a hardwired LED fixture
Decision factors
What you actually pay
Per switch, Kasa is the cheapest smart dimmer worth buying and Lutron’s manual dimmers are the cheapest good dimmers worth buying. A Kasa HS220 lands around $20 and gives you app and voice control. A Lutron Diva LED+ lands at roughly the same money and gives you no app at all — but a better dimming curve and no neutral requirement. A Caseta with a Smart Bridge is a $100-ish first switch and $50 to $70 per switch after that.
That first-switch cost is the thing that misleads people. Lutron looks expensive because the bridge is bundled into the entry price; it stops being expensive at the fourth or fifth switch, and the Pico remotes — battery-powered, stick anywhere, no wiring — are far cheaper than adding a second smart switch to a 3-way circuit. If you are dimming one room, Kasa wins on price comfortably. If you are doing a whole floor, the gap narrows sharply.
Where the premium genuinely goes on Lutron is the dimming electronics and the compatibility work. Lutron publishes tested compatibility lists for hundreds of specific LED bulbs and builds an adjustable low-end trim into the switch, which is what stops cheap LEDs from flickering, buzzing or refusing to strike at the bottom of the range. Kasa handles this with an in-app calibration routine that works, but with a narrower usable range on fussy bulbs.
Running costs are effectively nil for both. Neither uses meaningful standby power, neither has a subscription, and neither has consumables. The one real ongoing cost is bulbs: if you buy smart bulbs instead of a smart switch, you are on the hook for $6 to $10 per bulb every time one fails, against a one-time switch purchase that outlives many bulb generations.
Which one fits you
- Your wall box has no neutral wire Lutron Diva LED+ or Caseta Every Lutron dimmer here works on a two-wire circuit. The Kasa dimmer physically cannot, and no adapter changes that.
- The light is switched from two places Lutron Maestro LED+ It supports true multi-location dimming with companion switches. The Kasa HS220 is single-pole only and will not work on a 3-way at all.
- You have a neutral, one switch, and want smart control cheaply Kasa Smart Dimmer HS220 App, voice and schedules for roughly a third of a Caseta’s price, with no hub to buy or find a shelf for.
- You rent, or you want color as well as brightness Kasa Smart Light Bulbs No wiring, no permanent change to the property, and color temperature control that no dimmer switch here offers.
If neither is right
- Leviton Decora Smart Wi-Fi Dimmer A 600W-rated Wi-Fi dimmer that handles a bigger load than either brand here, useful for a bank of can lights. It still needs a neutral. Our Kasa vs Leviton comparison takes the two Wi-Fi options apart directly.
- Leviton Decora Slide Dimmer (non-smart) The cheapest competent LED dimmer that is not a Lutron, if you have decided you do not want an app in the wall. Fewer LED compatibility guarantees than the Diva, but noticeably cheaper.
- Philips Hue A19 White and Color Ambiance 3-Pack The mature version of the smart-bulb approach, with a far larger accessory ecosystem than Kasa and better dimming at very low brightness. Considerably more expensive per bulb, and it wants a Hue bridge to be at its best.
Which should you actually buy?
Check your wall box before you check the price. If there is no neutral wire, buy Lutron, because the Kasa dimmer will not work and no accessory fixes it. If the light is on a three-way circuit, buy Lutron, because the Kasa dimmer is single-pole only. If you have a neutral, a single-pole switch, and you mainly want an app and a voice command for around $20, the Kasa HS220 is an excellent buy and carries the largest owner-review base on this page. For a dimmer that just works forever with no account, the Lutron Diva LED+ costs the same as the Kasa and dims LEDs better.
How do the two brands actually differ?
Lutron invented the solid-state dimmer in 1961 and has spent six decades on the specific problem of controlling a light smoothly. That focus shows in unglamorous places: an adjustable low-end trim screw on the back of a $22 switch, published compatibility tables for hundreds of individual LED bulbs, and a smart line that deliberately avoids Wi-Fi in favor of its own radio because Wi-Fi is the least reliable thing in most houses.
Kasa is TP-Link’s smart home brand, and TP-Link’s core competence is networking hardware at aggressive prices. The HS220 is a well-made Wi-Fi device that happens to dim, which is a different design brief. It gets you app control, schedules and voice for a third of Lutron’s smart price, and it inherits Wi-Fi’s weaknesses along with its convenience.
The owner record tracks this precisely. Kasa’s dimmer has an enormous review base at a strong rating with connectivity as the recurring complaint. Lutron’s Caseta rates higher across a smaller base, and the complaints are about price and the bridge rather than about the dimming.
Why does the neutral wire decide everything?
A traditional dimmer sits in the path of the current going to the bulb and simply throttles it. It needs no neutral because it draws its own tiny power from the load. A Wi-Fi dimmer has a radio, a processor and a small power supply that must run continuously even when the light is off — and that requires a return path, which is the neutral.
In US homes, switch boxes wired before roughly 1990 frequently do not have one, because there was never a reason to run it. Pull the plate off and look: if the box contains only two conductors and a ground, Kasa is out of the conversation before any feature is compared. Retrofitting a neutral means running new cable inside a finished wall, which is not a weekend job.
This is precisely the gap Lutron’s Caseta line was built to fill. It is a smart dimmer that works on a two-wire circuit, which is why it costs what it does and why it remains the default recommendation for older housing stock. If you are in a house built in the last twenty-five years, the point is likely moot and the price comparison takes over.
Which one dims LEDs better?
Lutron, and the reason is the low-end trim. An LED draws a fraction of the current an incandescent bulb does, so a dimmer has to regulate an extremely small load. Below a certain point the bulb’s driver becomes unstable and you get flicker, buzz, or a bulb that simply refuses to light until you push the slider well up. Lutron’s LED+ dimmers have a physical adjustment that sets the minimum output to match the bulbs you actually installed, and it is the fix for every one of those symptoms.
Kasa handles the same problem with a calibration routine in the app, which works but gives you a narrower usable range on fussy bulbs. If you are running well-known dimmable LEDs, you will probably never notice. If you have a mixed bag of cheap bulbs from three different brands in one fixture, you will. Our guide to whether LEDs need a special dimmer explains why the old dimmer already in your wall is usually the actual culprit.
Which is more reliable day to day?
Lutron’s Caseta, and it is a design decision rather than a manufacturing one. Caseta does not use your Wi-Fi. It talks to the Smart Bridge over Lutron’s own Clear Connect radio, a low-frequency, low-bandwidth protocol with no competition from phones, laptops or a neighbor’s router. Reboot your router and the lights do not care.
Kasa dimmers sit on your 2.4GHz network alongside everything else in the house. Owners rate them well and most never have a problem, but the recurring complaint in the record is a switch that drops offline and needs an app reset or a breaker cycle. On a lamp that is a nuisance. On a stairwell light it is the reason people go back to a manual dimmer.
The mitigation is ordinary networking hygiene: keep the 2.4GHz band on a separate SSID, do not overload one access point, and put the switch within decent range. If your Wi-Fi already drops devices, do not add a light switch to it.
What about just buying smart bulbs instead?
It is a legitimate answer to a specific problem — a rental you cannot rewire, or a box with no neutral where you do not want to pay Caseta prices. Kasa’s bulbs dim, change color and change color temperature, which no dimmer on this page can do, and they require no electrical work at all.
The catch is unavoidable: the wall switch has to stay on, because a smart bulb with no power is just a bulb. In a household of one that is manageable. With guests, children or a cleaner, someone flips the switch and the lights are offline until somebody flips it back. There are workarounds — switch guards, or replacing the switch with one that keeps power on and sends commands instead — and all of them add cost or friction. Bulbs also scale badly: six bulbs in a kitchen cost more than one Caseta dimmer and need replacing individually as they fail.
The call
The Lutron Caseta Original is the best smart dimmer on this page and the right buy for any house without a neutral wire, any three-way circuit, and anyone who wants lighting that does not depend on Wi-Fi. The Lutron Diva LED+ is the value pick for anyone who does not want an app at all — same price as the Kasa, better LED behavior, no account required. The Kasa HS220 is a genuinely good deal in exactly one situation, and it happens to be a common one: a modern box with a neutral, a single-pole switch, and a budget under $25.
Everything here is ranked from aggregated Amazon owner ratings and published expert consensus rather than first-hand trials — see how we rank. For the wider field, read our best dimmer switch for LED lights rankings, and if you are wiring rather than shopping, start with how to install a smart light switch.