I'm growing 6 tomato varieties this year under home made indoor grow light boxes - Big Zac, Delicious, Romapo, Moreton, LaRoma II, and Brandywine Red (Landis Valley Strain).
I planted the seed on March 15th and the plants are about 4" to 6" tall now. I will move them outside to home made cold frame boxes at the end of April to harden off before garden planting in mid May sometime.