I am certainly not experienced enough to be giving advice but I think we've both got seedlings of a close age and I put mine under (diffused) light today. (technically they got a few hours last night, then the dark period and now they're on a regular day-night schedule) They seem to be LOVING it. (knock on wood) The stalks are standing up more straightly and the yellow bits have turned green and I see the makings of tiny little leaves forming. I put my cubes into soil but I don't think this is recommended yet. Too many changes at once seldom seem a good idea but I was being hasty last night.

You can see the latest photo in my little bitty sprout thread, if you're curious.