I purchased 6 of the self contained little greenhouse operations, the ones that have a black water tray, a seed tray and a clear plastic dome. Three used the compressed peat pellets and three used square peat pots containing a starting mixture. I planted a variety of tomatoes, cukes, zuchini, peppers, eggplants and brussel sprouts. Each tray held 72 peat pellets or 50 peat pots. This was too many but I wanted to allow for loss from possible damping off.
The trays were placed on glass shelving in South-Southwest windows(almost full sun) on Feb 14. Room temperature 65-75 degrees. Everything germinated well in 10-14 days. I placed a fan in the room to keep the air circulating.
However, within days I had 5-6 inch, spindly, white seedlings with two small leaves at the top of each plant. They would lean towards the sunlight and when I would gently turn the trays, they would break or become entangled with the other spindly plants. I did end up losing almost half of them by planting time in May. It wasn't from the anticipated damping off. It was through breakage.
Any advice from the experienced seed starters? A friend suggested that I shouldn't start them in full sun, but this didn't sound logical to me and he couldn't remember why you shouldn't do it.