Since this lamp has an F according to the currently valid energy efficiency classes 2021, this is completely ok and state of the art, i.e. "energy-saving".
If current knowledge says "energy-saving" must be A+++, this is no longer the case. This class/these classes no longer exist.

Since the beginning of 2021, there are new or changed conditions regarding energy declaration. The meaning of the energy efficiency classes and the classification of appliances into them have changed.

https://www.heise.de/news...
https://newlabel.ch/energieeti...