That very true, it cool to find out that factory HPS, being a dummy i did not realize this, even though seller did mention HPS but i thought it was converted over. being shipped with out the ballast and my orginal plan was thinking to converted back to mercs. so since i am a merc fan well be merc and when i am in a mood for HPS at least it get a merc convrsion bulb.
right now it got no ballast in it, and I dont have the the orginal HPS ballast. so i have to put my own ballast in it. but it still a nice fixture to have in the collection as it hard for me to get a street light in my collection. one day i wish i can get another OV25 merc with orginal ballast.
I got an OV-25 with an original MV ballast. That I am wanting to get rid of. It has two bullet holes in it but if you are interested in it you can buy it from me.