I started several varieties of onions indoors about 5 weeks ago and have been growing them under lights with about 15 hours a day of light. They are planted 80 or so to a 4 inch pot.

I noticed on one variety, Candy, that some of the seedlings look like they are starting to bulb already. Could this be possible? Is 15 hours of light too much for onion seedlings? Candy is supposed to be a "day neutral" variety.

Wondering if it is too soon to plant them out. They look strong and healthy, but are nowhere near pencil sized. Most have three true leaves at this point. They have been trimmed back a couple of times.

I am just north of the San Francisco bay. There may be a couple of light frosts still - but nothing that onions couldn't handle. I am wondering what the pros and cons would be for making the decision as to when to plant them out.

thanks for any thoughts on this!