The curtain is powered by the new LED controllable light source, which never need lamps replacing.

There are two types of LED Light Sources available:

Easy Switch, that can be connected to a Single or Double Wall
Switch Plate.  Or use a single Switch or a Nine Switch Keyboard to
select and mix the eight colours. When no switch is attached the
curtain gently cycles through the colours.

Switch4 Interactive allows you to have complete control of the
colours in 8 different passive and interactive programmes.
Use single Switches or a Nine Switch Keyboard, you can also use
a Universal Transmitter to control it radio remotely or via an iPad
with the Switch4 app.