Niceto see some. Here, they're virtually gone. I knew of a few, but they've disappeared in recent years. I know if a place called Roky Point Amusement Park. (which closed in 1996 BTW.) It's in Warwick, Rhode Island. It has 1960's M-400s, M-400 split doors, OV-15, OV-25, AE 25, and early M-400R2. They are all 400w MV! The lights are still standing, but who knows for how long. The state recently bought the remaining land, and they may start working on it soon . I hope they wait a few years, so I can get some. My parents won't let me get any more. Any that I get, I have to give them away or sell them.

There are a bunch of HPS OV-25s in Washington DC from the 70s and still proudly servicing the area!

There was an HPS OV-25 right by the Hotel I stayed at in DC. Didn't know what it was at the time, but now I know.

the only HPS silverliner's ive seen are at a Steel Manufacturing plant located on US Highway 259 South of Lone Star,Texas..possiblilty they could be original but the presence of metal halide ones along with Unistyles in the same variety made me think some could be conversions.

You can actually easily screw in a 400 watt MH into a 400 watt MV ballast...I believe the 400 watt MV and MH are the most backward compatiblity of all