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Helen, what Lesley described is the general norm for perennials - blooming in "the second year" (i.e. after one "dormant" period).
I got some lewisia cotyledon seed from the SRGC seedex in January 2008, it germinated immediately outside (mild Winter here of course) and one or two flowered at the end of August 2008. I got around 80 plants, so those that flowered were quite rare.
I don't think Lewisias in general need a "dormant" period before flowering, it's just a matter of having enough time to grow to the right size. I'd be surprised if they flowered in spring if sown the immediately preceeding winter but I never sow anything in winter and never under lights, so you'd have to try to see.
You won't regret it Helen !!
here, at least- is much shorter for many of the other posters on this forum...