After being subscribed to Parrot175's youtube channel for a while, I was very surprised and shocked to see that he found a North American 150w M102 pulse start metal halide fixture that was factory wired with a SEPARATE choke ballast coil and a SEPARATE transformer coil in the fixture for ballasting the lamp. I was especially surprised to see this type of ballasting circuit because in North America, most HID ballasts consist of the choke ballast coil and the transformer coil lumped together in one complete iron core. Since he is unfamiliar with this type of ballasting setup, he actually mistakenly referred to both coils as "ballasts". The fixture featured in this video is an American Electric 150w M102 pulse start metal halide floodlight.

Here is the link to this video:

https://www.youtube.com/watch?v=XWgAN0eJb5U

If you look closely, the coil with the white label is the transformer while the coil with the red label is the actual 240v series choke ballast.

But the series choke is still 60hz, which means that it won't work correctly in 50hz countries.

Has anyone said it would..?

Must've been really expensive at the time too, as PSMH was still relatively young then.

Yeah, must have been a early setup too. Would be interesting to get one of these lights with a separate step up and choke coil.

Some early HPS luminaires also had a similar arrangement. The older HPS Unidors also had a separate transformer and choke coil.

Some early integrally ballasted mercury luminaires were also configured like this. And one of the first F40 fluorescent luminaires had a single step up and dual chokes, one of each lamp.

That wasn't unusual for fluorescent fixtures here. We used to have a dual 5ft 65W T12 fixture in the garage at my parents' house, it had a completely separate choke ballast and starter for each tube. Of course we didn't have the need to step up the supply voltage as you did.

But the series choke is still 60hz, which means that it won't work correctly in 50hz countries.

You are right about that because if a 60hz ballast is operated at the correct voltage at a lower frequency, the core would saturate and cause the choke ballast to overheat.