I currently grow 3 types of lettuce, some spinach, and tamed wild greens indoors in trays under T5s. I haven't had store lettuce for salads in a year. I do pick up dressing and organic tomatoes but I think I may add a full sized cart soon and begin with micro-greens as well.

With the recent power outage half started to flower within 2 days. The plant were like i said very old but if the power wasnt off im sure they could have been kept in semi stasis and only producing a leaf or two a day for each.

I have a couple small boxes with LEDs i havent gotten around to setting in into framed boxes.

Am growing entirely in 3 inch pots of fully organic soil and was feeding wormcasting and guano tea. The roots hang down into the gutters in the trays and drink solution just like hydro. chose all the methods and points and put them together. The trays are fill once per day or every other day. the tiny pots all have soggy soil so you could go three between waterings. Passive/evaporative is the name of this method.

I don't know a whole lot about plants, but I built a solar water heating system this past summer for heating my pool. This could easily be adapted to work for heating shower water or a number of other things.

It was actually really simple. Nail two boards into a big plus. as big as you want. Coil irrigation pipe into a big coil. As big as you want. I think I used 200' of pipe. I put it on my roof and pumped water from the pool, through the pipes back to the pool. On any given day, say mid 80's, I was getting 3-4degrees warmer than the pool.

Not sure if this helps at all, but figured I'd offer it up.