I"m don't speak English well, and rely on online translating to write in this site.Please forgive me if my choice of my words looks like offensive, while that isn't my intention.I only working with the international date format (dd.mm.yyyy).I lives in Israel, which is a 220-240V, 50hz country.
https://www.youtube.com/watch?v=YUVCBdZMquo&feature=youtu.beHere's a video of a 500w incandescent getting overloaded and explodes.
Polam Gostynin OUS-400 - First Polish HPS Luminaire, released in 1978, made at Elgo Lighting Industries in Gostynin.