We decided to separate the twelve Spiegel lamps we have into different groups since those lamps were made in three materials: Fiberglass, aluminium and steel. The ones in steel and fiberglass are 5 mm deeper than the fiberglass versions so we mount them separate from the fiberglass lamps that we later will use as a set with 9 lamps together.
To start with, we mounted two orange lamps (in steel and aluminium) wich you see here.