Do Smart Bulbs Use Electricity When Off? How Much They Really Use

Yes, smart bulbs use a small amount of electricity even when they appear to be off — as long as they still have power from the wall.

When you turn a smart bulb off through an app, voice assistant, schedule, or automation, the LEDs stop producing light, but the bulb’s electronics remain powered. That allows it to stay connected and respond when you ask Alexa or Google Home to turn it back on.

The amount of standby electricity is usually very small. For example, TP-Link lists the Kasa KL125 at 0.2 watts of standby power, compared with a maximum operating consumption of 8.8 watts. A Philips Hue White Ambiance specification sheet lists maximum standby power of 0.5 watts for that particular model.

So yes, smart bulbs use electricity when off, but for a single modern bulb, the annual cost of that standby power can be surprisingly small.

How Much Electricity Does a Smart Bulb Use When Off?

There isn’t one standby-power figure that applies to every smart bulb.

Power consumption depends on the bulb, its wireless technology, electronics, firmware, and operating state. Manufacturer specifications are therefore more useful than assuming every smart bulb consumes the same amount.

Here are two real examples:

Smart bulb	Standby power	Maximum operating power
Kasa KL125	0.2W	8.8W
Philips Hue White Ambiance example	Up to 0.5W	8.5W

TP-Link specifically notes that a connected smart bulb remains powered in standby and lists 0.2W standby consumption for the KL125. Signify’s specification sheet for the Philips Hue example lists a maximum standby figure of 0.5W.

These figures shouldn’t be treated as universal numbers for all Kasa or Philips Hue bulbs. Different models can have different specifications.

If you’re choosing affordable bulbs for your home, our best smart light bulbs under $20 guide compares several budget options.

Why Do Smart Bulbs Use Electricity When They’re Off?

A regular LED bulb and a smart LED bulb behave differently when you turn them off.

With a conventional bulb, switching off the wall switch cuts electrical power to the bulb. There is no need for the bulb to remain connected to anything.

A smart bulb needs to be available for the next command.

Depending on the product, it may communicate using Wi-Fi, Bluetooth, Zigbee, Thread, or another technology. Its communication and control electronics need some power to remain available.

Imagine turning your bedroom bulb off using an app and then saying:

“Alexa, turn on the bedroom light.”

For that command to work, the smart bulb must remain powered so its connected electronics can receive and respond to the instruction.

The same applies to schedules and automations. If you have an automation that turns your lights on at sunset, physically cutting power to the bulbs prevents them from responding until power is restored.

This is why smart bulbs are normally left powered at the wall and turned on and off electronically.

If you’re new to home automation, our guide to setting up a smart home from scratch explains how lighting, speakers, plugs, security devices, and other smart-home products fit together.

How Much Does Smart Bulb Standby Power Cost?

Even though smart bulbs use electricity while in standby, the annual cost is usually very small because standby consumption is typically only a fraction of a watt.

You can estimate the yearly energy use with this formula:

Standby watts × 24 hours × 365 days ÷ 1,000 = kWh per year

For example, a smart bulb using 0.2 W in standby would consume:

0.2 × 24 × 365 ÷ 1,000 = 1.752 kWh per year

At an illustrative electricity rate of $0.20 per kWh, that works out to about:

$0.35 per year

A bulb using 0.5 W in standby would consume:

0.5 × 24 × 365 ÷ 1,000 = 4.38 kWh per year

At the same electricity rate, that would cost about:

$0.88 per year

What If You Have Multiple Smart Bulbs?

The cost becomes more noticeable when you multiply standby consumption across an entire smart home, although it can still remain relatively small.

At $0.20 per kWh:

Number of bulbs	0.2 W standby per bulb	0.5 W standby per bulb
1	About $0.35/year	About $0.88/year
10	About $3.50/year	About $8.76/year
20	About $7.01/year	About $17.52/year

These examples are estimates rather than universal smart-bulb costs. Actual standby consumption varies by model, and your real cost depends on your electricity rate.

The bigger point is that standby power matters more at scale. One bulb may cost very little to keep connected, but dozens of always-powered smart devices can collectively add to a home’s background electricity consumption.

What Happens If You Turn a Smart Bulb Off at the Wall?

Turning a smart bulb off at the physical wall switch cuts power to the bulb, so its standby electricity consumption effectively stops.

However, you also lose the smart features that depend on the bulb remaining powered.

While the wall switch is off, you generally won’t be able to:

• turn the bulb on remotely
• control it with a voice assistant
• use app controls
• trigger automations that require the bulb
• run schedules that require the bulb to be powered
• communicate with the bulb over Wi-Fi, Zigbee or Thread

This is why smart bulbs are normally designed to remain powered at the wall even when their LEDs are turned off through an app, voice command or automation.

What Happens When You Turn the Wall Switch Back On?

The exact behavior depends on the bulb.

Some smart bulbs return to their previous state, while others turn on at a default brightness or use a configurable power-loss recovery setting. Repeatedly cutting power can also temporarily remove the bulb from its smart-home network until it reconnects.

Check the manufacturer’s settings if power-on behavior is important to you.

Should You Turn Smart Bulbs Off at the Wall at Night?

Usually, there is little reason to switch a smart bulb off at the wall every night purely to save electricity.

Doing so eliminates its standby consumption, but it also removes the connectivity that makes the bulb smart. Considering how small the standby cost can be for an individual bulb, the savings may not justify losing remote control, schedules and automations.

If you’re going away for an extended period, don’t need the bulb’s smart functions, or simply want to eliminate its standby load entirely, cutting power at the wall is an option.

For everyday use, however, leaving the bulb powered and switching it off through your smart-home system is usually the more practical approach.

Should You Leave Smart Bulbs Powered All the Time?

If you want their smart functions to remain available, usually yes.

Keeping the wall switch on allows the bulb to respond to features such as:

• app control
• voice commands
• schedules
• timers
• scenes
• routines
• remote control
• occupancy-based automations

This doesn’t mean the light itself needs to remain illuminated. Turning a smart bulb off electronically stops the light output while allowing the communication electronics to remain available.

ENERGY STAR notes that smart lighting can use features such as geofencing, occupancy sensing, remote shutoff, and away modes to reduce unnecessary lighting use.

ENERGY STAR’s smart-lighting guidance

So although leaving a smart bulb connected creates a small standby load, that connectivity can also help prevent a much larger waste: leaving the actual light on when nobody needs it.

Do Smart Bulbs Save Electricity Overall?

They can, but simply replacing a regular LED bulb with a smart LED bulb doesn’t automatically guarantee lower electricity use.

The potential savings largely come from how you use the smart features.

For example, you might configure your lights to:

• turn off automatically when you leave home
• follow a daily schedule
• switch off when a room is unoccupied
• dim at certain times
• turn off remotely when you forget
• participate in a whole-home away routine

ENERGY STAR specifically highlights geofencing, occupancy sensing and remote control as smart-lighting features that can help reduce unnecessary energy use.

Consider the Kasa KL125 as an example.

TP-Link lists maximum operating consumption at 8.8W and standby consumption at 0.2W.

If an automation prevents an 8.8W bulb from being unnecessarily illuminated for several hours, the electricity avoided during those hours can outweigh many hours of 0.2W standby consumption.

However, someone who already uses efficient LED bulbs and consistently turns them off when they aren’t needed may see little energy reduction simply by replacing them with smart bulbs.

Smart bulbs are primarily about convenience, automation, remote control, and customization. Potential energy savings are an additional benefit rather than a guarantee.

Wi-Fi vs Zigbee vs Thread: Which Uses Less Standby Power?

It’s tempting to assume that the wireless protocol tells you exactly how much standby power a bulb will consume, but the comparison isn’t that simple.

The actual standby consumption depends on the entire bulb design, not just whether it uses Wi-Fi, Zigbee, or Thread.

Wi-Fi smart bulbs

Wi-Fi bulbs can communicate directly through your home Wi-Fi network and often don’t require a dedicated smart-home hub.

That makes them particularly convenient for beginners and smaller smart-home setups.

The Kasa KL125 is an example of a 2.4GHz Wi-Fi bulb. Despite being Wi-Fi connected, TP-Link lists its standby consumption at just 0.2W.

That is a useful reminder that you shouldn’t assume every Wi-Fi bulb has high standby consumption.

Zigbee smart bulbs

Zigbee is a low-power wireless technology commonly used for smart-home devices. It also supports mesh networking, allowing compatible devices to help extend the network.

Philips Hue is one of the best-known examples of a smart-lighting ecosystem using Zigbee.

Thread smart bulbs

Thread is an IP-based, low-power mesh networking technology that is increasingly important in Matter-enabled smart homes.

Thread and Matter are related, but they are not the same technology.

Matter provides a common application layer for compatible smart-home devices, while Thread can provide the network over which Matter devices communicate.

Our Matter vs Zigbee vs Z-Wave comparison explains these differences in much more detail.

You can also read what Matter is and how it works if you’re choosing devices for a new smart home.

The important point for electricity consumption is simple: don’t choose a bulb solely because you assume its wireless protocol will use less electricity. Check the actual manufacturer’s standby specification whenever it is available.

Smart Bulbs vs Regular LED Bulbs: Which Uses More Electricity?

When producing light, both smart bulbs and conventional LED bulbs can be highly energy-efficient. The important difference appears when the lights are turned off.

A conventional LED bulb connected to a physical switch generally uses no electricity when that switch cuts power to the bulb.

A smart bulb is different when it remains powered but is turned off through an app, voice assistant or automation. Its LEDs stop producing light, but its communication and control electronics may continue using a small amount of electricity so the bulb remains available for commands.

Feature	Smart LED bulb	Regular LED bulb
Uses electricity while producing light?	Yes	Yes
Can consume power while electronically off?	Yes	Generally not when power is physically cut
Needs standby connectivity?	Usually	No
Remote/app control	Yes	No
Automations and schedules	Yes	No
Standby consumption	Model-dependent	Effectively zero when disconnected from power

This means a smart bulb can use slightly more electricity overall than a comparable conventional LED bulb because of its standby consumption.

However, that doesn’t automatically mean a smart bulb will increase your total lighting bill.

Features such as schedules, occupancy-based automations, remote control and automatic shutoff can potentially reduce the amount of time a light spends illuminated. Whether those savings outweigh the bulb’s standby consumption depends on how the bulb is actually used.

So the fairest comparison isn’t simply that regular LEDs are more efficient. Smart bulbs add a small standby load in exchange for connectivity and automation features that conventional LED bulbs don’t provide.

How to Reduce Smart Lighting Electricity Use

If reducing your electricity consumption is the goal, focus first on the times when your lights are actually illuminated unnecessarily.

A few practical changes can have a bigger impact than repeatedly disconnecting bulbs to eliminate tiny standby loads.

Use schedules to turn lights off automatically at predictable times. Set occupancy-based automations where they make sense. Use away routines or geofencing if your smart-home platform supports them. Dim lights when full brightness isn’t necessary, and group rooms so multiple forgotten lights can be turned off at once.

ENERGY STAR recommends several of these approaches, including geofencing, occupancy sensing, remote shutoff, and integration with away modes.

It also makes sense to check power specifications when buying bulbs. Two products offering similar brightness and features don’t necessarily have identical operating or standby consumption.

Is Smart Bulb Standby Power Something to Worry About?

For most households, not particularly.

It exists, and it shouldn’t be described as zero. But the numbers can be small.

A 0.2W standby load running continuously for an entire year uses approximately 1.75 kWh. Even 0.5W continuously uses about 4.38 kWh annually.

The bigger picture becomes more important as you add devices.

One smart bulb is unlikely to have a meaningful impact on your electricity bill. But a home containing dozens of smart bulbs, plugs, speakers, displays, cameras, hubs, thermostats, and other always-connected devices will have a larger combined standby load.

That makes efficiency worth considering when building a smart home — without becoming overly concerned about a single efficient bulb drawing a fraction of a watt.

How to Check Your Smart Bulb’s Standby Consumption

Start with the manufacturer’s technical specifications.

Look for terms such as:

• standby power
• standby power consumption
• networked standby
• power consumption when off

Don’t assume that every model from the same manufacturer has identical consumption.

For example, TP-Link publishes separate power specifications for its bulbs, and the current KL125 page explicitly lists 0.2W standby consumption.

You can also measure a lamp using a suitable plug-in electricity meter. However, very small standby loads require a meter capable of accurately measuring fractions of a watt.

Manufacturer documentation is therefore often the easiest starting point.

Frequently Asked Questions

Do smart bulbs use electricity when switched off?

Yes. If a smart bulb has been turned off electronically but remains powered at the wall, it typically continues consuming a small amount of electricity so its connected features remain available.

How many watts does a smart bulb use when off?

There is no universal figure. TP-Link lists 0.2W standby consumption for the Kasa KL125, while the Philips Hue White Ambiance example referenced in this guide lists maximum standby power of 0.5W. Check the specifications for your particular model.

Do smart bulbs use electricity when the wall switch is off?

If the wall switch completely disconnects electrical power, the bulb cannot continue normal powered standby operation. It also won’t be able to receive app, voice, or automation commands until power is restored.

Is it cheaper to turn smart bulbs off at the wall?

Technically, yes, because completely disconnecting the bulb eliminates its powered standby consumption. In practice, the savings for one efficient bulb can be very small, while switching it off at the wall disables its connected features.

Do Philips Hue bulbs use electricity when off?

Yes, if they remain powered and connected. For example, a Philips Hue White Ambiance specification sheet lists maximum standby power of 0.5W. Exact consumption depends on the model.

Do Kasa smart bulbs use electricity when off?

Yes. TP-Link explicitly states that connected Kasa bulbs use electricity in standby. The KL125 is specified at 0.2W standby consumption.

Can smart bulbs save electricity?

They can help reduce unnecessary lighting use through features such as schedules, occupancy control, geofencing, and remote shutoff. ENERGY STAR specifically identifies several of these features as ways smart lighting can help save energy.

That doesn’t mean a smart bulb automatically uses less electricity than an equivalent regular LED. Actual savings depend on the products and how they’re used.

Should smart bulbs stay powered all the time?

Normally, yes, if you want their smart features to remain available. Disconnecting power prevents the bulb from responding to remote commands until power is restored.

Final Verdict: Do Smart Bulbs Use Electricity When Off?

Yes. Smart bulbs generally use a small amount of electricity when they’re turned off electronically but remain powered at the wall.

That standby power keeps the bulb’s connected electronics available for apps, voice assistants, schedules, scenes, and automations.

How much electricity a smart bulb consumes in standby depends on the product. As real-world manufacturer examples, the Kasa KL125 is rated at 0.2W standby, while the Philips Hue example discussed above lists a maximum of 0.5W.

At an illustrative electricity price of $0.20/kWh, a continuous 0.2W load works out to roughly $0.35 per year, while 0.5W works out to around $0.88 per year.

For most households, that isn’t a compelling reason to switch smart bulbs off at the wall and lose their connected features.

A better approach is to use those features to your advantage. Schedules, occupancy automations, geofencing, dimming, and remote shutoff can help prevent lights from remaining fully illuminated when nobody needs them.

How We Researched This Guide

This guide is based on manufacturer technical specifications and energy-efficiency guidance rather than assuming all smart bulbs consume the same amount of standby electricity.

We used TP-Link’s published specifications for the Kasa KL125 as one current example. TP-Link lists 8.8W maximum operating consumption and 0.2W standby consumption for that model.

We also checked Philips Hue technical documentation from Signify, including a White Ambiance specification listing maximum standby power of 0.5W.

For broader energy-saving guidance, we referenced ENERGY STAR’s smart-lighting guidance, which discusses geofencing, occupancy sensing, remote control, and other smart-lighting features that can help reduce unnecessary energy use.

The electricity-cost examples in this article use $0.20/kWh purely as an illustrative rate. Your actual cost depends on your electricity tariff and the specific standby consumption of your bulbs.