hmm. that could pose a real problem is the lighting (...) ban every electrode and filament lamp. utility companies using series will have to spend big money on converting circuts to multiple.

I think some company was thinking of making a isolation transformer type device that allowed LED, induction and other 120v multiple lights to work on existing 6.6A series circuits. I think the link was on one of the Yahoo streetlighting groups.

Anyway I wonder if LED runway lights are still series, if I remember correctly the incandescent ones worked on a 6.6A circuit.

8 years ago when Duquesne Light replaced the remaining mercury vapor street lights in the city of Pittsburgh, the new high pressure sodium street lights were wired parallel. Overhead wiring was installed and connected to the new street lights since the old underground wiring was all series.

series stuff here disappeard a LONG time ago. By the late 60s it was gone and replaced with multiple/parallel. (which one is it, multiple or parallel?) even in the incandescent days i think there were some multiple wired lights.

There is a solution for using LED fixtures on series circuits, which is to use a 6.6A transformer for each light.

Hmm. my solution is just don't use LEDs! lol Do they make series MH fixtures? i know they made MV and do make HPS series lights.
The LED fixtures plus the transformers for every light would probably cost more than simply running a secondary feed with HPS lights

LED street lights are too dreary anyway.

like it or not, leds have taken a hold in the city of los angeles. its too late for old tech already.