Design Philips Design for Philips HUE Concept Calla extension Anthracite is an expansion for the Calla Hue Base Unit and does not work alone. Once you have the Calla Hue Base Unit, you can connect up to 4 Calla Extension, allowing you to use five lamps through one power outlet—practical light for your driveway or garden path, or a cosy, inviting light to set the mood on the terrace on a late summer evening. Philips Hue outdoor lighting solutions allow you to bring your smart lighting outside. You get full control of the light on your terrace, in your garden, along your driveway, or on the walls of your home with access to 16 million colours, brightness settings, timer settings, and many other functions—all via your smartphone. Find more information about the options presented by Philips Hue here, and read more about setting up your system.