Same here - last year I had more blooming in July that I had ever had before, but August/September is when the yard is full of color.
Smaller plants/flowers (Poms. Orchids) I will plant with the tubers 4" down, but mostly 6" - supposedly they will make more tubers if you plant them even deeper, but I haven't noticed that. In the baggies they are 2-3" deep already, so an additional 2-3" down - I just pinch off any leaves that will be below the soil line.
The few of my plants that have gotten kind of tall and spindly, I will plant deeper.
My shop lights have multiplied over the years. I buy the cheapest $10 fixtures, and regular fluorescent bulbs. The first year I bought 8 of them (two per shelf), and then added a few more every year for a while. I don't have any more space now - so this is it. and I cut down on how many annuals and vegetable I grew from seed this year, so didn't even use them all. For about 5 years I didn't buy any pre grown plants or any bulbs or tubers. I just grew from seed, and traded for dahlias - it was my way of justifying the expense of the lights and trays etc. I try to be frugal with my gardening, since as you must know................it can become pretty pricey if you let it get out of hand.
I have only been selling my extra tubers for the past two years. While it isn't what you would call a money maker, it has given me a extra couple hundred a year to put into the garden guilt free.