Four bulbs from an unrealized project for sale, new and never used
https://www.osram.com/ecat/Lok-it!%20Power%20Series%20(PS)-Lok-it!-Discharge%20lamps-Entertainment-Specialty%20Lighting/com/en/GPS01_3116846/ZMP_4059564/
compatible lamp
Robe BMFL
Price 100 €