Hi Umberto,
A little confusion here. I specifically recall seeing the glass GSX Jetways having interior fluorescent lights on the ceiling which looked awesome and illuminated the passengers nicely at night. I also remember seeing a Jetway operator that was inside the jetway control area.
Today I connected the glass jetway at the FSDT Zurich airport at night and the jetway operator was not there. Additionally, the jetway was very very dark and a look inside showed that the lights inside the jetway were not working.