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Wednesday, November 4, 2026

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The Best Smart Light Bulbs (2026)

The best smart light bulbs of 2026: Philips Hue, LIFX Color, Kasa KL135, Govee H600A, Nanoleaf Essentials, and more, compared on brightness, colour, and hub needs.

PLThePickLedger ResearchEditorial teamUpdated Research-based assessment · The Best Smart Light Bulbs (2026)

Our top picks at a glance

Best overall

Philips Hue White and Color Ambiance A19Philips Hue White and Color Ambiance A19

Households building a whole-home lighting system, who want scenes, routines, dimmers, and sensors that all work together.

Best colour quality

LIFX Color A19, 2-PackLIFX Color A19, 2-Pack

Buyers who judge a bulb by its colour: deep reds, true blues, and whites from candle warm to daylight cool.

Best bright Wi-Fi bulb

Kasa Smart KL135, 4-PackKasa Smart KL135, 4-Pack

Rooms that need real light, not mood light: kitchens, living rooms, and home offices fitted with standard A19 lamps.

Researched, not guessed Specs verified against manufacturer docs 10 picks, each matched to a specific buyer Updated 2026-11-02

For most buyers, the Philips Hue White and Color Ambiance A19 is the pick: the best scenes, accessories, and all-round light quality. Colour purists should buy the LIFX Color A19, bright-room owners the Govee H600A, and Matter households the Nanoleaf Essentials A19. First-time buyers on a tight budget should start with the Kasa KL125 and upgrade only if the habit sticks.

The short answer

The picks, ranked

Side-by-side comparison of every pick
PickShape and baseBrightnessColour and whiteBuy
Philips Hue White and Color Ambiance A19Best overallPhilips Hue White and Color Ambiance A19A19, E26 screw base800 lumens, 60W equivalentFull colour plus tunable whiteCheck price
LIFX Color A19, 2-PackBest colour qualityLIFX Color A19, 2-PackA19, E26 screw base1100 lumens, 75W equivalent-Check price
Kasa Smart KL135, 4-PackBest bright Wi-Fi bulbKasa Smart KL135, 4-PackA19, E26 screw base1000 lumensFull colour plus tunable white, dimmableCheck price
Govee H600A 1200 Lumen, 2-PackBest for bright roomsGovee H600A 1200 Lumen, 2-PackA19, E26 screw base1200 lumens, 85W equivalentRGBWW colour plus tunable white, dimmableCheck price
Nanoleaf Essentials A19, 2-PackBest for Matter and ThreadNanoleaf Essentials A19, 2-PackA19, E26 screw base1000 lumens, 60W equivalentRGBTW colour plus tunable white, dimmableCheck price
Philips Hue White A19, 4-PackBest white-only systemPhilips Hue White A19, 4-PackA19, E26 screw base810 lumens, 60W equivalent-Check price
Govee BR30 H6010, 2-PackBest for recessed cansGovee BR30 H6010, 2-PackBR30 flood, E26 screw base1200 lumens, dimmableRGBWW colour plus tunable whiteCheck price
Govee E12 H600B, 4-PackBest for chandeliersGovee E12 H600B, 4-PackB11 candelabra, E12 screw base450 lumens, 40W equivalentRGBWW colour plus tunable white, dimmableCheck price
Kasa Smart KL125, 2-PackBest budgetKasa Smart KL125, 2-PackA19, E26 screw base800 lumens, 60W equivalent-Check price
Govee H6008, 2-PackBest value colour bulbGovee H6008, 2-PackA19, E26 screw base800 lumensRGBWW colour plus tunable white, dimmableCheck price

Best overall

Philips Hue White and Color Ambiance A19

The system pick: the deepest scenes, the widest accessory range, and colour that flatters a room rather than shouting at it.

Philips Hue White and Color Ambiance A19
The deepest scenes and accessory range, with colour and white quality that flatter any room.

Strengths

  • The Hue app and scene gallery remain the benchmark for smart lighting, with wake-up fades, timed routines, and room-by-room control that feel considered rather than bolted on.
  • Colour and white quality are consistently natural: warm whites look candle-like, cool whites look clean, and saturated colours stay rich without turning a living room into a nightclub.
  • The accessory ecosystem is unmatched, with dimmer switches, motion sensors, and wall switches that keep the lights usable when a phone is in another room.

Limitations

  • The full experience, including control away from home and the widest automation options, needs the Hue Bridge, which is a separate purchase.
  • A single bulb costs more than budget Wi-Fi rivals, so fitting out a whole house with Hue is a noticeably larger investment.
  • The bridge and app add a layer of setup that a single-bulb buyer may find unnecessary compared with a direct Wi-Fi bulb.

What owners report

Commonly praised

  • The app scenes make an ordinary evening feel deliberately lit without any fiddling
  • Colours stay gentle and natural in a living room rather than looking theatrical
  • The dimmer switch keeps the lights usable when nobody has a phone handy

Common complaints

  • The bridge feels like an unwelcome extra purchase after already buying premium bulbs
  • Fitting out several rooms quickly becomes a noticeably expensive project
  • Setup takes longer than a simple Wi-Fi bulb because the system has more pieces to join together

Recurring themes from owner reviews on retailers and forums, summarised by our editors. Updated October 2026.

Key specifications for Philips Hue White and Color Ambiance A19
Shape and baseA19, E26 screw base
Brightness800 lumens, 60W equivalent
Colour and whiteFull colour plus tunable white
ConnectionBluetooth and Zigbee; Hue Bridge optional for full features
Voice controlAlexa, Google Assistant, and Apple HomeKit

Best for: Households building a whole-home lighting system, who want scenes, routines, dimmers, and sensors that all work together.
Skip if: You want one cheap bulb for one lamp, or you refuse to buy a bridge for the full Hue experience.

Best colour quality

LIFX Color A19, 2-Pack

The colour purist: the widest white range and the most saturated colour here, over plain Wi-Fi with no hub in sight.

LIFX Color A19, 2-Pack
The widest white range and the most saturated colour here, over plain Wi-Fi with no hub.

Strengths

  • The white range is exceptionally wide, from very warm candle tones to very cool daylight, which flatters both evening rooms and home offices.
  • Colour saturation is the strongest here: reds stay red and blues stay blue at brightness levels where budget bulbs wash out.
  • Direct Wi-Fi with Matter support means no hub to buy, and the bulb joins a modern smart home without a brand-specific bridge.

Limitations

  • Premium pricing per bulb makes a whole-house LIFX fit-out the most expensive hub-free route here.
  • The LIFX app, while capable, has fewer curated scenes than Govee and less accessory depth than Hue.
  • Wi-Fi dependence means a weak router signal shows up as a slow or missed bulb before anything else in the house complains.

What owners report

Commonly praised

  • Candle-warm whites make late evenings feel calm in a way cheaper bulbs never managed
  • Reds and blues stay deep and true even when the lights are dimmed low
  • Skipping a hub entirely kept the first purchase simple and self-contained

Common complaints

  • The per-bulb cost stings when planning a whole-house changeover
  • The app scene collection feels sparse next to the libraries of livelier rivals
  • A weak router signal shows up first as a slow or unresponsive bulb

Recurring themes from owner reviews on retailers and forums, summarised by our editors. Updated October 2026.

Key specifications for LIFX Color A19, 2-Pack
Shape and baseA19, E26 screw base
Brightness1100 lumens, 75W equivalent
White range1500K to 9000K, dimmable
ConnectionWi-Fi with Matter support, no hub required
Voice controlAlexa, Google Assistant, and Apple HomeKit

Best for: Buyers who judge a bulb by its colour: deep reds, true blues, and whites from candle warm to daylight cool.
Skip if: You want a budget bulb, a bridge-based mesh, or the accessory range that Hue offers.

Best bright Wi-Fi bulb

Kasa Smart KL135, 4-Pack

The brighter Kasa: noticeably more light for kitchens and living rooms, with the same hub-free Wi-Fi simplicity.

Kasa Smart KL135, 4-Pack
Noticeably brighter than standard bulbs, with hub-free Wi-Fi simplicity and a friendly four-pack value.

Strengths

  • The higher brightness makes a visible difference in rooms with one ceiling fitting, where an 800-lumen bulb can feel underpowered.
  • Full colour and tunable white with dimming cover both task lighting and evening light from the same bulb.
  • The four-pack price per bulb keeps a whole-room upgrade affordable, and every bulb joins the same Kasa app and voice routines.

Limitations

  • Wi-Fi only on the 2.4GHz band, with the same setup sensitivity to merged-band routers as the KL125.
  • The bulb runs slightly larger and warmer in use than a standard bulb, so check shade clearance in small enclosed fittings.
  • Scene depth and automation still trail Hue, and there is no hub option for buyers who later want a mesh system.

What owners report

Commonly praised

  • The extra brightness finally made a single-ceiling kitchen feel properly lit
  • All four bulbs joined the same room group without repeated setup struggles
  • Voice dimming works reliably during busy cooking and homework hours

Common complaints

  • The bulb runs warm in small shades, so owners check fitting clearance before buying
  • Setup still demands patience with routers that merge the two Wi-Fi bands
  • Automation options feel basic next to the deeper routines of hub-based rivals

Recurring themes from owner reviews on retailers and forums, summarised by our editors. Updated October 2026.

Key specifications for Kasa Smart KL135, 4-Pack
Shape and baseA19, E26 screw base
Brightness1000 lumens
Colour and whiteFull colour plus tunable white, dimmable
Connection2.4GHz Wi-Fi, no hub required
Voice controlAlexa and Google Assistant

Best for: Rooms that need real light, not mood light: kitchens, living rooms, and home offices fitted with standard A19 lamps.
Skip if: Your lamps are small or shaded, where the extra brightness is wasted, or you need Matter or Thread support.

Best for bright rooms

Govee H600A 1200 Lumen, 2-Pack

The bright-room specialist: the strongest light here, with Govee scenes and music sync for rooms that do more than sit still.

Govee H600A 1200 Lumen, 2-Pack
The strongest light here, filling large rooms from a single fitting with scenes and music sync.

Strengths

  • The high brightness genuinely fills a large room from a single fitting, which is the H600A's whole reason to exist.
  • Govee's scene library and music sync suit lively rooms, with preset scenes for films, parties, and seasonal decorating.
  • RGBWW colour plus tunable white means the same bulb handles bright task light by day and coloured evening light by night.

Limitations

  • The Govee app is feature-rich to a fault, and first-time users may find the scene and automation menus busier than Kasa or Hue.
  • No hub or Thread option, so a large house full of Wi-Fi bulbs leans harder on router coverage than a mesh system would.
  • At full brightness the bulb is best in open fittings; small enclosed shades trap heat and mute the light it is capable of.

What owners report

Commonly praised

  • One bulb now lights a large living room corner that used to stay gloomy
  • Party scenes genuinely transform a Friday evening without extra equipment
  • Bright daylight white makes a home office feel alert during working hours

Common complaints

  • The app menus bury simple controls behind layers of effects and promotions
  • Ceiling installation is awkward because pairing rewards standing close to the bulb
  • Small enclosed shades dull the brightness advantage the bulb is bought for

Recurring themes from owner reviews on retailers and forums, summarised by our editors. Updated October 2026.

Key specifications for Govee H600A 1200 Lumen, 2-Pack
Shape and baseA19, E26 screw base
Brightness1200 lumens, 85W equivalent
Power12W
Colour and whiteRGBWW colour plus tunable white, dimmable
Voice controlAlexa and Google Assistant

Best for: Large living rooms, kitchens, and open-plan spaces where standard bulbs leave corners dim.
Skip if: You want Hue-style accessories, or your lamps are small, shaded, or enclosed, where this brightness is wasted.

Best for Matter and Thread

Nanoleaf Essentials A19, 2-Pack

The future-proof pick: Matter over Thread for a responsive mesh, plus the Nanoleaf app for owners who like to play with light.

Nanoleaf Essentials A19, 2-Pack
Matter over Thread for a responsive mesh, in a bulb that grows with a modern smart home.

Strengths

  • Matter over Thread gives a responsive, self-healing mesh: bulbs answer quickly and keep working when one device drops off.
  • Colour and tunable white cover the full everyday range, with music sync and scenes in the Nanoleaf app for playful rooms.
  • Direct control from the Nanoleaf app without a separate hub suits a small Matter setup that may grow later.

Limitations

  • Thread needs a border router, such as a recent smart speaker or hub, to reach its full potential, which is an extra thing to check before buying.
  • The Nanoleaf app leans playful, and buyers who want plain, quiet lighting controls may prefer Hue or Kasa.
  • Premium pricing for a bulb whose main advantage only appears inside a Matter and Thread home, not in a single-lamp setup.

What owners report

Commonly praised

  • Lights respond promptly even as more Matter devices join the home
  • Music sync and scenes make a games room feel intentionally designed
  • App-only control worked fine before any wider smart home hub arrived

Common complaints

  • Thread benefits only appear after checking for a compatible border router
  • The playful app tone suits fun rooms better than quiet, plain lighting control
  • Paying a premium feels hard to justify for a single lamp with no wider system

Recurring themes from owner reviews on retailers and forums, summarised by our editors. Updated October 2026.

Key specifications for Nanoleaf Essentials A19, 2-Pack
Shape and baseA19, E26 screw base
Brightness1000 lumens, 60W equivalent
Colour and whiteRGBTW colour plus tunable white, dimmable
ConnectionMatter over Thread, Wi-Fi, and Bluetooth; Thread border router needed for Thread
Voice controlAlexa and Google Assistant

Best for: Households already building on Matter, especially with a Thread border router, who want bulbs that stay responsive as the system grows.
Skip if: You have no Thread border router and no plans to add one, or you want the simplest possible first bulb.

Best white-only system

Philips Hue White A19, 4-Pack

Hue quality without the colour premium: warm white light, dimming, and routines for rooms that never need a party mode.

Philips Hue White A19, 4-Pack
Full Hue system depth for rooms that only ever need warm white light.

Strengths

  • You get the full Hue system, scenes, routines, and accessories, for rooms where colour would never be switched on anyway.
  • Warm white light at 2700K suits bedrooms and living rooms, and dimming from the app or a Hue dimmer feels smooth rather than steppy.
  • The four-pack format suits fitting out a bedroom or a hallway in one purchase, with every bulb joining the same room group.

Limitations

  • No colour at all, so a room fitted with these bulbs cannot join a colour scene later without swapping bulbs.
  • The Hue Bridge is still the route to the full feature set, including away-from-home control.
  • Per bulb, white-only Hue costs more than white-only Wi-Fi rivals, and the premium buys system depth rather than light quality alone.

What owners report

Commonly praised

  • Warm white light looks soft and welcoming in bedrooms from the first evening
  • Dimming from the app feels smooth all the way down to a nightlight glow
  • Buying four together made matching every lamp in one hallway straightforward

Common complaints

  • Owners who later want colour must swap bulbs instead of simply switching a setting
  • The bridge requirement still applies for anyone wanting control away from home
  • White-only bulbs feel overpriced to buyers who never use the wider system features

Recurring themes from owner reviews on retailers and forums, summarised by our editors. Updated October 2026.

Key specifications for Philips Hue White A19, 4-Pack
Shape and baseA19, E26 screw base
Brightness810 lumens, 60W equivalent
WhiteWarm white, 2700K, dimmable
ConnectionBluetooth and Zigbee; Hue Bridge optional for full features
Voice controlAlexa, Google Assistant, and Apple HomeKit

Best for: Buyers who love the Hue app and reliability but only ever use warm white light, in bedrooms, hallways, and kitchens.
Skip if: You want colour for films, parties, or seasonal scenes, since this bulb produces warm white only.

Best for recessed cans

Govee BR30 H6010, 2-Pack

The recessed-can fix: a flood shape that fills a can properly, bright enough for kitchens and hallways that A19 bulbs leave patchy.

Govee BR30 H6010, 2-Pack
A flood shape that sits properly in cans and spreads bright light evenly.

Strengths

  • The BR30 flood shape sits correctly in a recessed can, spreading light evenly instead of glaring from a bulb buried too deep.
  • High brightness suits cans spaced across a kitchen ceiling, where each fitting must cover a patch of worktop on its own.
  • The same Govee scenes and music sync carry over, so cans join the same colour routines as the rest of the house.

Limitations

  • The wider flood shape fits cans only, so it cannot move to a table lamp if you rearrange a room.
  • Wi-Fi and Bluetooth setup in a ceiling can is awkward, since the bulb is overhead and the pairing window rewards patience.
  • A full kitchen of cans adds up quickly, and buying BR30 bulbs for every can costs more than a few A19 lamps.

What owners report

Commonly praised

  • Light now spreads evenly across the kitchen instead of pooling under each can
  • The flood shape sits neatly in recessed fittings without glaring edges
  • Scenes carry across cans and lamps so the whole room changes together

Common complaints

  • Pairing a bulb overhead in a ceiling can tests patience during installation
  • Replacing every can in a kitchen adds up to a larger bill than expected
  • The wide shape cannot move into a table lamp when a room gets rearranged

Recurring themes from owner reviews on retailers and forums, summarised by our editors. Updated October 2026.

Key specifications for Govee BR30 H6010, 2-Pack
Shape and baseBR30 flood, E26 screw base
Brightness1200 lumens, dimmable
Colour and whiteRGBWW colour plus tunable white
ConnectionWi-Fi and Bluetooth, no hub required
Voice controlAlexa and Google Assistant

Best for: Kitchens, hallways, and living rooms lit by recessed cans, where standard bulbs sit too deep and throw light unevenly.
Skip if: Your fittings are standard table lamps or pendants, where an A19 bulb fits and costs less.

Best for chandeliers

Govee E12 H600B, 4-Pack

The chandelier solution: small-base colour and tunable white for candelabra fittings that standard smart bulbs simply cannot enter.

Govee E12 H600B, 4-Pack
Small-base colour and Matter support for chandeliers and sconces that standard bulbs cannot fit.

Strengths

  • The E12 base fits where no A19 bulb can go, which finally brings chandeliers and sconces into the same scenes as the rest of the house.
  • Matter support helps the bulb join a modern multi-brand home, rather than living only inside the Govee app.
  • The four-pack suits a multi-arm chandelier, where buying bulbs one at a time would leave arms mismatched for weeks.

Limitations

  • Modest brightness per bulb is right for a chandelier with several arms, but weak as the only light in a room.
  • Small bulbs in a chandelier mean pairing and resetting involves a ladder, so get the setup right before the bulbs go up.
  • Colour in a chandelier divides households: one person's festive is another person's distraction, so agree on scenes first.

What owners report

Commonly praised

  • Chandeliers finally join the same evening scenes as the rest of the house
  • Four matching bulbs made a multi-arm fitting look unified from day one
  • Matter support helped the bulbs sit comfortably in a mixed-brand home

Common complaints

  • Reaching a chandelier with a ladder for setup or resets is nobody's favourite chore
  • One small bulb alone cannot light a room, so multi-arm fittings are essential
  • Colour in a chandelier splits opinion in households that prefer plain warm light

Recurring themes from owner reviews on retailers and forums, summarised by our editors. Updated October 2026.

Key specifications for Govee E12 H600B, 4-Pack
Shape and baseB11 candelabra, E12 screw base
Brightness450 lumens, 40W equivalent
Colour and whiteRGBWW colour plus tunable white, dimmable
Connection2.4GHz Wi-Fi with Matter support, no hub required
Voice controlAlexa and Google Assistant

Best for: Chandeliers, wall sconces, and small lamps with E12 candelabra bases that have been left out of every smart bulb roundup.
Skip if: Your fittings are all standard E26, where a brighter A19 bulb is a better buy, or you need a single very bright bulb.

Best budget

Kasa Smart KL125, 2-Pack

The honest budget starter: full colour, dimming, and voice control over Wi-Fi, with no hub and no learning curve.

Kasa Smart KL125, 2-Pack
Full colour and voice control over Wi-Fi, with no hub and the simplest setup here.

Strengths

  • Setup is genuinely simple: screw in, connect to Wi-Fi in the Kasa app, and the bulb answers to Alexa or Google Assistant within minutes.
  • Full colour and tunable white cover the everyday range, from warm evening light to bright daylight white for a home office.
  • No hub keeps the total cost at the bulb itself, which is why this is the easiest smart bulb to recommend as a first experiment.

Limitations

  • Wi-Fi only on the 2.4GHz band, so a router that merges bands or a weak signal in a far room can make setup fiddly.
  • The Kasa app scene and routine options are solid but shallower than Hue, with fewer curated scenes and less granular automation.
  • Colour at low brightness can look less refined than premium rivals, with some shades washing out when dimmed hard.

What owners report

Commonly praised

  • Setup took only a few minutes from unboxing to voice control working
  • Colour changes respond quickly to voice commands in everyday use
  • Two bulbs were enough to test smart lighting without committing to a whole system

Common complaints

  • Pairing stalled when the router kept pushing the phone onto the faster band
  • Scene choices feel thin compared with the libraries offered by more playful brands
  • Colours lose some richness when the bulb is dimmed very low at night

Recurring themes from owner reviews on retailers and forums, summarised by our editors. Updated October 2026.

Key specifications for Kasa Smart KL125, 2-Pack
Shape and baseA19, E26 screw base
Brightness800 lumens, 60W equivalent
Power9W
Connection2.4GHz Wi-Fi, no hub required
Voice controlAlexa and Google Assistant

Best for: First-time smart bulb buyers, renters, and anyone who wants colour in one or two lamps without buying into a system.
Skip if: You want a hub-based mesh for a large house, Thread or Matter support, or the deepest scene library.

Best value colour bulb

Govee H6008, 2-Pack

The value colour bulb: Govee scenes, music sync, and warm-to-cool white at a price that makes every lamp in the house fair game.

Govee H6008, 2-Pack
Govee scenes and music sync at a price that makes colour in every room realistic.

Strengths

  • The scene library is the draw: dozens of presets for relaxing, gaming, films, and holidays, without building scenes from scratch.
  • Music sync, using a phone microphone or a paired Govee device, makes the bulb a genuine party piece rather than a novelty used once.
  • Wi-Fi plus Bluetooth gives a second connection route when Wi-Fi setup stalls, which rescues many first installations.

Limitations

  • Standard brightness only, so a single bulb in a large room with one fitting can feel modest next to the H600A.
  • The app packs in features that casual users will never touch, and the important controls can hide behind them.
  • Colour accuracy at the extremes, deep blue and deep red, is lively rather than precise, which matters for photography and art display.

What owners report

Commonly praised

  • Preset scenes mean a relaxing evening starts with one tap instead of manual tuning
  • Music sync turns an ordinary gathering into something guests comment on
  • Bluetooth backup saved a setup that had stalled on Wi-Fi alone

Common complaints

  • The busiest app screens make finding a plain warm white setting harder than it should be
  • Deep blues and reds look vivid rather than accurate for careful decorating
  • A single bulb feels modest in a big room lit from only one fitting

Recurring themes from owner reviews on retailers and forums, summarised by our editors. Updated October 2026.

Key specifications for Govee H6008, 2-Pack
Shape and baseA19, E26 screw base
Brightness800 lumens
Colour and whiteRGBWW colour plus tunable white, dimmable
ConnectionWi-Fi and Bluetooth, no hub required
Voice controlAlexa and Google Assistant

Best for: Buyers who want colour in several rooms at once, and who enjoy scenes and music sync rather than plain white light.
Skip if: You want the calmest app experience, Hue accessories, or a bulb for a room that needs more than standard brightness.

How we chose

Brightness matched to the room

A bulb that is too dim for its room is a failed purchase whatever its colour range, so brightness was weighted first. Standard rooms suit 800 lumens, large rooms and kitchens need 1000 or more, and chandeliers need several modest bulbs rather than one bright one.

White quality before colour quantity

Colour gets the attention, but white light is what a bulb produces most of the time. We credited bulbs whose warm whites look natural and whose cool whites stay clean, and penalised bulbs whose whites lean green or grey.

Connection honesty

Wi-Fi, Zigbee, and Thread each suit a different home, and we said which each bulb needs. A hub-free bulb that leans on a weak router is not simpler than a bridged bulb in a large house, and a Thread bulb without a border router is not yet a Thread bulb.

System cost, not bulb cost

A bulb that needs a bridge, and a room that needs four bulbs, change the real price. We compared the cost of a working room of light, including any hub, rather than a single bulb price in isolation.

Questions, answered

Do I need a hub for smart light bulbs?

Not always. Wi-Fi bulbs from Kasa, Govee, and LIFX connect directly to your router with no hub. Philips Hue works over Bluetooth for a single room, but the full Hue system, including away-from-home control and accessories, needs the Hue Bridge. Nanoleaf Essentials uses Matter over Thread, which needs a Thread border router for the full mesh benefit.

Will smart bulbs work with my existing dimmer switch?

Usually no, and this is the most common smart bulb mistake. Smart bulbs dim themselves through the app or voice control, and a traditional wall dimmer that chops the power supply can make them flicker, buzz, or drop offline. Leave the wall switch fully on and dim from the app, a voice assistant, or a smart dimmer made for the system.

What happens to smart bulbs when the Wi-Fi goes down?

The wall switch still works as a plain switch: turn the light off and on and the bulb comes back at a default state. App and voice control return when the network returns, and hub or Thread systems keep local control working even when the internet itself is down, which is one reason they suit larger homes.