Guys, I've always wondered. Between Wi-Fi, Zigbee, Bluetooth, and others, what are the advantages of each protocol? Which one should be preferred in terms of security, battery life, etc.? If anyone has experience, that's great, but let's keep it general.
How do smart bulbs communicate, I wonder?
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Doesn't really matter, we've all wondered how smart devices communicate with each other. Wi-Fi seems to be the most common, but I've heard Zigbee is more advantageous for battery-powered devices. Which one have you looked into?
You can choose Wi‑Fi if you’re putting it in a public space, but remember it’s the most problematic protocol security‑wise. I isolated my home Wi‑Fi network that runs the smart bulbs with a VLAN because anyone could join and send commands, though it takes some effort. Zigbee and Thread (the backbone of Matter) are much more stable, and the battery life is significantly better. My Xiaomi bulbs have gone a full two years without needing a charge.
If you go with Bluetooth Low Energy (BLE), the signal is weak, so you can’t have too many walls between the lamp and the controller, but it’s the most hassle‑free option for local security. I’m currently controlling my lamp directly over BLE from a Huawei tablet, completely independent of the neighbors’ network. Bottom line: if you want a lot of devices in your house constantly communicating, go with a Zigbee/Thread hub (like a Philips Hue Bridge). If you only need to control devices from your phone in a single room, a BLE‑based brand (such as Lutron Caseta) makes more sense.