just wanted to answer some questions about the lights i used in the christmas diorama. they are from LGB G scale train equipment - so i thought it will fit in this section.
i bought some of the laterns from LGB which are cheaper then the original playmo laterns from the 1900 series.
you need then some connectors , cables , a contributor and a power transformer ( i used the playmobil transformer )
you should get connectors and cables with fittting colours. you may also need a special screwdriver for the small screws.
when you connect everything correct you will also be able to dim the lights. in germany the transformer should have 230volt. i don´t know about other countries…
hope the following pic is helpfull.