Is my Sengled bulb Wi-Fi, Zigbee or Bluetooth? Read the model code
From Tomorrowish, the makers of Relight, an independent iPhone app for Sengled Wi-Fi bulbs. Every fix on this page works without it. Checked November 2, 2026.
Every fix for a Sengled bulb depends on what kind it is, and the bulb tells you. Look at the label on its base, just above the screw thread, for "M/N" or "Model". Sengled's help center put it simply: "The model number will start with an E, B, W, or Z," and it sent E and Z codes to its Zigbee help page.
| Code starts with | Kind | What it needs now |
|---|---|---|
| W | Wi-Fi | Your 2.4 GHz Wi-Fi. Works from the wall switch; local control on your network (Home Assistant, an iPhone app) |
| E or Z | Zigbee | A Zigbee hub: an Echo with a built-in hub, SmartThings, Hubitat or Home Assistant with a Zigbee radio |
| B | Bluetooth Mesh | An Echo, which Sengled's guide used to add them |
Sengled Wi-Fi model codes
Sengled's own Wi-Fi troubleshooting page listed W11-N11, W21-N11, W11-N1150, W21-N13 and W11-N13. Owners in the SengledTools project also run W31-N15, W31-N11, W21-U23, W12-N15 (a colour bulb) and W1E-NC1 candelabra bulbs, and its reset guide covers Sengled Wi-Fi light strips, TV light strips, bar lights, string lights and plugs. If yours starts with W but isn't in these lists, it is still a Wi-Fi model; the first letter is what matters.
Can't read the label?
- Look in your router's device list. Wi-Fi bulbs connect to your router like a phone does; one owner's
W12-N15 named itself
Sengled_WiFi_Color_W12-N15there. Zigbee and Bluetooth bulbs never appear. - Look for its setup network. A Wi-Fi bulb in setup mode broadcasts a Wi-Fi network named like
Sengled_Wi-Fi Bulb_XXXXXX. Zigbee bulbs don't. - Check the box or your order. The model code is usually printed there as well.
Which way each kind can go now
- Wi-Fi: stay on your Wi-Fi and use local control. Don't reset them.
- Zigbee: move them to a hub that isn't Sengled's; after a reset (at least 10 quick flips) they pair like any Zigbee bulb.
- Bluetooth Mesh: they work with Alexa as long as the Echo they were added to does.
Bulbs Relight can't help
Relight only talks to Wi-Fi (W) bulbs. Zigbee and Bluetooth bulbs never join your Wi-Fi, so no iPhone app can reach them over it; move Zigbee ones to a Zigbee hub instead. Better to know that before you download anything.
Questions
How do I know if my Sengled bulb is Wi-Fi?
The model code on its base starts with W, for example W21-N13 or W11-N13.
What does a model code starting with E mean on a Sengled bulb?
It is a Zigbee bulb. It needs a Zigbee hub, such as an Echo with a built-in Zigbee hub, SmartThings or Hubitat.
Is the Sengled W21-N13 Wi-Fi or Zigbee?
Wi-Fi. Sengled's own Wi-Fi troubleshooting page lists the W21-N13.
Do Sengled Zigbee bulbs need the Sengled hub?
No. Any compatible Zigbee hub works, including an Echo with a built-in Zigbee hub.