Wi-Fi for smart lights:
2.4 GHz, mesh and routers

Your smart lights join 2.4 GHz Wi-Fi only. Almost every home router has it, but many hide it behind one network name, which is where most Wi-Fi trouble starts.

Pairing: the phone and the light on the same network

While you pair, your phone must be on the 2.4 GHz network, because the app reads the network name from your phone and passes it to the light. If your phone is on 5 GHz, the app shows "Your light needs 2.4GHz" and offers to open your Wi-Fi settings, or lets you type the 2.4 GHz name yourself. After pairing, your phone can be on any network, or on mobile data, and the light keeps working.

Mesh systems and combined networks

Mesh systems and newer routers often run 2.4 GHz and 5 GHz under one name and move each device between them. Most let you show the 2.4 GHz band under its own name, or hold the phone on 2.4 GHz while you pair. Look for a band or "2.4 GHz" setting in your router's app, or ask your provider. Once a light is paired, it stays on 2.4 GHz by itself.

If three lights work on your network and one does not, the network is not the problem. Look at that one light: see A light shows offline.

Guest networks

Pair on your main network, not a guest network. Guest networks often keep devices from talking to each other, which is exactly what the app and the light need to do.

Weak signal

Lights at the far end of the garden or behind a thick wall can sit at the edge of your Wi-Fi. If all your lights drop from time to time, a 2.4 GHz extender or a mesh point near the lights usually steadies them.

How many lights your network can take

Each smart light joins your Wi-Fi as its own device, and some routers only allow so many devices at once. If you have a lot of devices and the app finds a new light but it will not join, check your router's connected-device limit in its app or settings. In the app, keep one home to 120 lights or fewer and one space to 50 or fewer; a very large setup can use a second home (You › App settings › Homes › New home), for example one for inside and one for outside.

Changed your router or password?

Your lights remember one network, so they show offline until you reconnect them. See New router or Wi-Fi password: reconnect your lights.

Where the app keeps your Wi-Fi password

On your phone only, for the next light you pair, and it is sent only to the light. You can see, change or forget it under You › App settings › Wi-Fi for pairing. Changing it there does not move lights that are already connected.