Over-wintering orchids and keeping them happy and willing to bloom sounds challenging and unusual to me!
For merely starting seedlings a few times per year, I would get 4-foot T5 fixtures if they were on sale, and otherwise T8 or T8-HO, if they sell such things without big markups. Mainly to keep the original purchase price as low as possible.
Right now I only have (blush) a pole lamp with three relatively high-wattage CFL screw-in bulbs. It's what I had on hand, needing no mounting.