In May 2024, I discovered these older PHILIPS NVF 250 lights in France. These fixtures for 250W and 400W MV-lamps were introduced in the second half of the 1950s.
The owner of the garage in Le-Cannet-des-Maures was persuaded to switch on the lights for about 10 minutes so that I could take photos.
One fixture is fitted with a 250W MV lamp and one fixture is fitted with a 500W SBMV lamp.
Some technical informations about this fixtures:
Page 67 of the PHILIPS catalog eclairage (F) shows the variants from 80W to 400W. There were two different sized fixtures.
Source: PHILIPS catalog eclairage, page 67, France 1965