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I'd raise that up to 24-36" till they're a bit older, just to be safe. I use LED but rarely even get that close to seedlings. Stretching in the seedlings have a few factors, including how compact the soil is (more compact, less stretch at first.) They look normal though.
-------------------- Any help given is for educational purposes only. Its your responsibility not to break any applicable laws Bamboo Bongs I make | Perfect Dry and Cure | Grapegod under LED “Human beings, vegetables, or cosmic dust, we all dance to a mysterious tune intoned in the distance by an invisible player.” ~ Albert Einstein