Light recommendations for starting onions from seeds

[steve ok]

I just started some onions from seeds. They are just starting to sprout and need to go under the lights. Searching the internet some say 18 hours lights on, 8 hours off. Others say 12 on, 12 off for onions.

If you have started onion seeds under the lights for a number of years, I'd love to know your thoughts.
Thanks, Steve

[Rockoe10]

What is the variety of Onion? Onions are finicky and the length of light is not the same for all of them.

[steve ok]

I am starting Walla Walla Sweet, Sweet White Spanish, and Sweet Spanish Yellow Utah Jumbo. All long day for my Pacific Northwest garden.

[ponyexpress]

Personally, I'm doing 12 hours of light. That's the general recommendation that I have found.

I have planted Amish Bottle Onion seeds in early June and they started bulbing shortly after the summer solstice. So I don't think you want to be using 18 hours of light.