It is a fine dining restaurant that is awarded two Michelin star since 2015.

[1] Head chef of Spectrum is Sidney Schutte.

Schutte, a former chef of "De Librije" and Librije's Zusje in Zwolle, returned to the Netherlands from Hong Kong, where he worked in The Landmark Mandarin Oriental.

[5] Contrary to the first "Librije's Zusje", this restaurant is not owned by Jonnie Boer but a kind of franchise.

[6] In October 2018 it was announced that "Librije's Zusje" would become independent and would change its name per 1 January 2019.