Berlin, Germany Is Still Divided ... By Lightbulbs?

Chris Hadfield, a Canadian astronaut, tweeted the image to the right while in space.

It's Berlin, Germany at night.

Fun fact: I'm of German descent.

Re: My last name (Hartinger) and genetics (large nose).

Sad fact: German was divided for decades by the Berlin Wall.

I couldn't find any information about the difference of lightbulbs of East and West Germany, as depicted in the picture, but