How much is shipping to central Florida?

I have that ballast! Just got it today* but no 35 watt High pressure sodium lamps. Too bad! I need to get some more diverse lamps.

 I have a few 35w HPS . I'll never use them .  If you pay shipping , I'll send them to you .

An individual lamp is 3.25A and each lamp is half the arc voltage drop (135V) of a 1000W M47 probe start metal halide lamp (270V). When a pair of 400W M59 probe start metal halide lamps are wired as a series pair, the arc voltage drops of both lamps sum up together at roughly 270V.

Isn’t one 400 3.25 amp? Or is two together 3.25 amp?

You could run both of them in series, but I would recommend reducing the capacitor value to ensure they run properly. You would need to get a clamp meter to ensure that they are running at the proper 3.25A they require.

How mad would it be to run two 400 watt metal halide lamps in series on a 1000 watt halide ballast?

I have that ballast! Just got it today* but no 35 watt High pressure sodium lamps. Too bad! I need to get some more diverse lamps.

I think one idea might be to use a 70W M98 pulse start metal halide HX ballast to run a pair of 35W S76 high pressure sodium lamps in series. Or another idea is to import lamps, ballasts, and fixtures from abroad if you can save up for them. I often do that to help me from not getting bored.

I have a few magnetic ballasts, but the problem is I am bored. Anything I can do that would be fun ( except watching lamps warm up) with these ballasts without hurting any lamps or equipment?

Not surprised unfortunately. It's just cheaper to do a full changeout especially considering the age of the installation as keeping any of the existing stuff would be a hassle down the line (in their eyes).

San Diego still had a few series circuits when I went down there and went to quite a few places a few years back, though what I saw was mainly HPS. Not sure if any of it is still around today. One of the segments from that same news channel also shows some series LPS if I recall correctly.