It's definitely doable since a few companies made the remote can ballasts to run either of those light sources but I wonder if there were any current or historical installations out in the wild that had HPS or MH clamshells. Especially any roadway installations. I know a few places converted their mercury clamshells to LED but that conversion is less involved than convert to a different HID source.
In my area, during the MV clamshell to HPS conversion, new arms were installed with HPS cobraheads.
Anyway any one here know of such installations, either still intact or historical.
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