Phillip, onion seedlings tend to get "leggy" (for me, at least), regardless of the amount of light they receive; I find that giving them several "haircuts," trimming back to about half their height, before planting out makes them stronger and a lot more manageable. I'll be starting my onions inside, under lights, in about a week, for planting out in mid to late May; in your zone, you may be able to sow the seeds directly in the garden.