Wow Randy Nice looking Plants!
The lights are just regular pepper size bulbs mounting under the cabinets. See pic below. Not meant for growing, but was just convenient.
Since I live in Albuquerque, it's considered high desert. It gets very cool to cold at night. Even in late April, i believe the temps were dropping to 50 and occassionally a bit below. We had a very windy past couple of days. I think it was strong enough to break one of my small tomato plants.
On dividing plants. Probably wasn't an issue for you b/c you used good compost or fertilizer. dummy me, I bought some potting soil from Lowes (which is basically garbage) and then mixed it with our local soil, which is more garbage. Splitting the plants and then transplanting them deeper into garbage soil definitely stunted their growth. I could see the difference between the same species of tomatoes that weren't transplanted. I know better for next year.
Our weather was so iffy in April, I decided to not chance it by taking it outside and forgetting it. Weather in Albuquerque can fluctuate really fast in an instant. We occassionally have rains while it is sunny. I even saw it hail around here briefly in late Feb while it was sunny out. hard to believe but true.
My main issue which I am now sure of is lack of good nutrients for them. I'm not sure it was overwater although you could be right. Tomato plants and others thrive in hydroponics systems where it is in water basically 100% of the time. As long as their is nutrients and (sun)light plants will keep growing. I was just making the point that having light on all the time won't hurt them either.