Here’s how to set it up.

launch the Home app.

Go to theHometab, if you don’t start there.

The “Add Accessory” command in the Home app

Mark Mawson/Getty Images

Tap theplus signin the upper-right corner of the screen.

confirm Siri Is Active

Next, confirm Siri is active on your iPhone.

Scroll down and tapSiri & Search.

Two young women lying on a bed. Lights at the foot of the bed.

Mark Mawson/Getty Images

You may need to set up Hey Siri functionality by following the instructions on the screen.

For example, say, “Hey Siri,” and then “Turn on the lights.”

To turn off the lights, simply activate Siri and say, “Turn off the lights.”

Turning on all Siri options on an iPhone

kick off the Homeapp and check that you’re on theHometab.

Tap thePlus(+) sign.

You now have the option to create a suggested Scene or a custom one.

Screenshot showing how to turn on lights using Siri.

For this example, tapI’m Home.

In some versions of iOS, this Scene may be calledArrive Home.

The Scene will display all available accessories, including your smart lights.

The Add Scene command in the Home app

For this Scene, it recommends turning on all available lights at 70 percent brightness when you get home.

Customize this array by disabling lights you don’t want to activate.

Next, adjust the brightness at which individual lights come on when the Scene is activated.

Setting up a Scene in the Home app

On an iPhone with 3D Touch, press firmlyuntil the brightness control appears.

Slide up and down to adjust the brightness.

On an iPhone without 3D Touch, press and hold until the brightness control appears.

Selecting color and brightness for a light in a Scene

Slide up and down to adjust the brightness.

Select a color for the lights by using one of the options below the slider.

Tap a preset option twice to initiate the color customization screen.

Adding a new Scene to Favorites in Home

SelectDoneto store your selection.

Once set, you’ll see the lights that are set up and their predetermined brightness levels.

Tap the switch byInclude in Favoritesto add it to the Home tab, and then tapDoneto finalize your scene.

On the main Home screen, you’ll now seeArrive Homelisted as aFavorite Scene.

Tap it once to run it.

Launch Siri and say, “Run I’m home.”

Siri will activate the scene, and you’re able to enjoy your lighting.