Train Tech Smart Light - Party (Disco) The Smart Light developed by Train Tech is a new system which can easily be fitted into buildings, locomotives, vehicles and other areas of your railway. The light is just 1cm square and simply connects to a 9 - 16 volt power supply and only requires 2 wires and no additional setting up. It can also be fitted to a battery for portable usage. This set simulates a party or disco in a nightclub, house or pub. The unit is pre-set to produce a mixture of flashes and colours.