Many GRAU lights can be dimmed using the optional GRAU app control. This allows you to experience and use the full potential of your light. The GRAU app control enables continuous and interference-free dimming in a range from 100% to 1%. It also allows you to individually program lighting scenes, animations and groupings, for example. The lights can also be operated independently of the app using a wireless switch or a wall switch in combination with a Bluetooth transmitter module, or even easier, using an EnOcean switch that requires no power or batteries. GRAU app control is suitable for three-wire cabling as found in most households. The GRAU app is available free of charge for iOS or Android. You can find more information here.