Mark,

a few words of wisdom: CUT THEM BACK!

Most of the plants you mentioned: brugs, solanum, passion flower, salvia, etc... can be cut back drastically. Many do not even need light to overwinter in a cool room. You want to let them rest/go dormant ,not force them to grow under lites.

The mistakes that most people make:

NOT cutting back hard
Potting up in pots way too big! ( my 8' tall brugs get coatracked (pruned back to nubs) and stuffed in 10" pots with some potting mix and stored in basement).
Too much water from Oct till March

Mine overwinter under plain old 48" shoplights with warm white bulbs, set on a $10 on/off timer for 16 hours a day.

You can check out what I am doing here in MD near Washington, DC with tropicals, much like you are at the link below.

If you have more questions, please email me directly
Good luck

Boca Joe

Here is a link that might be useful: Growing Tropicals in a Temperate Climate

Hey Mark, I certainly can relate. For me though, it's bananas, bird of paradise, ginger, citrus plants, etc with only limited window space. I try to cram things by the window and hope that they get at least adequate light until spring (reduce watering and shorter days often slow down their growth anyway).

I do overwinter some bananas downstairs in the dark basement and this has worked, though as a precaution I also overwinter some bananas as houseplants upstairs. The "indoor" leaves that they get overwinter (in poor light) are easily burnt when they go back outdoors in spring (or shredded by wind), but they are quick growing plants so as long as they survive winter, they recover somewhat once outside again. I guess this could also apply to other quick growing tropicals too, as long as you somehow keep the plant alive, it can recover and because it's quick growing it might still look decent next year.

Here's wishing for a sunroom or heated greenhouse.

Good luck,
Glen