hi socrates
are you sure because the floor it is not the same underneath it has some squear holes i think , that could the light fit
Yeah, you are right... ...and obviously I am wrong.

You should never talk about sets you did not have your hands on.
Luckily I have an guardian angle in the background and she saves me for spreading wrong informations...

There has been a discussion about this at klickywelt also (see
here)
Well, so obviously, there is a way to install the lights in the set, as it can be seen in this picture of a beautiful illuminated 5301... ...even though playmo never officially supported this idea?! (or am I wrong again?

)
best,
socrates