I ran into problems at the seedling stage my soil wasn't prepped properly as I like to grow in organic soil. So I had to transplant them back out of the final 11L pots into small pots to try save them, I manged to save most of my young seedlings, they also had a 2 days in the dark due to broken light but that got fixed when I purchased the MIGRO CMH 315w, check it out here https://www.migrolight.com/the-new-migro-315w-cmh-economy/ its at a great price for a high quality CMH light!¬ with added UV-B and far red for enhanced flowering its a quality light.
Anyway I would say I was set back a few days at the least with the transplant and dark period, just hoping they don't stunt the overall size in the end, we shall see.