How Philips Hue works
Hue App ... Hue Bridge ... lamps ... switches
Hue by Philips is a leading smart lighting for individual smart home solutions. The Hue Bridge serves as a central gateway for the configuration and communication of all Hue system components. The Hue App on a mobile device is used for configuration and operation.
To access system components with the Hue app, the Hue Bridge must be connected to a Wi-Fi router. The Hue app communicates with the bridge via Wi-Fi, and the bridge in turn communicates with system components via ZigBee radio.
Wi-Fi is therefore only necessary if the system is to be configured or operated via the Hue app. If, for example, the Wi-Fi function is deactivated at night, the lamp can still be switched on via ZigBee radio on the button of a Hue switch.
The transmission technology used is ZigBee Light-Link. Up to 25 Friends of Hue switches and a total of 50 system components can be connected, configured and controlled with a Hue Bridge.