The wires from the LED can be simply fed down the column of the lamp and out the side, although you will have to cut a slot in the base for this. Alternatively, if you are planning to fix the lamp to, say, a station platform, you would drill a hole through the base and the platform and run the wires through those to a power supply.
There is some appropriate detail moulded into the sides of the base of the lamp column, and for those with a steady hand and good eye, this could be highlighted with brush or pen in gold or some other suitable colour. The two circles on the column, btw, are greatly exaggerated by the lighting in this picture. In real life, they are barely visible and certainly not noticeable.
As regards size, this is the lamp alongside a standard 7.5cm Playmobil figure, with her boyfriend showing off to the camera.
For those who want actual figures, the height is approx 18.5cm or 7 and one eighth inches.
Overall, a nice addition to a station or street scene.