There is provided herein controllable power and lighting arrangement suitable for use in commercial and/or domestic applications. There is particularly provided a method for the arrangement and automatic control of light emitting diode (LED) lights, and optionally non-LED based devices, powered by low voltage AC power distributed on bus bars. In addition there is provided a power and lighting arrangement which is especially suitable for use in a uniform and safe manner in close proximity to living organisms, particularly organisms capable of growth, such as plants, in a domestic or commercial growth system.