My husband rigged up several more grow lights, aiming at the plants from all directions. We waited a few more days. No change.
And then we decided that a huge electric bill was not justified for a handful of tiny tomatoes.
So down it all came, everything was turned off and disassembled, and we're back to rethinking all this. We haven't given up yet but we need to find a way to go about it differently. At least we know that pollination occurred, so there's potential. And it was great fun watching the twelve-foot tomatoes grow and grow into a pungent jungle.
Light has returned to the dining room (the tomatoes were blocking the window before). The house seems very quiet now, without the frequent gush of water.