Just transplanted a seedling into a soil mix I'm giving an early try. never done soil vegging under lights before though.
Normally I just ran coco and verm with a general vegetable gardening hydro food if I was vegging. But I haven't done it for so long my pH and PPM meters both gave in.
Anyway, I have 2 seedlings of about equal size, one in coco/verm one in 50/50 potting soil and compost. Both organic made from garden waste, next to each other. There are more, but these two are the test case to see how strong the compost is.
Oh yeah also trying 20/4, seems to be the new fad.