caffeineanswered grow question 9 months ago All looks good to me, your light is quite powerful for seedlings, so make sure to hang it on the correct height:
Between 200-400 PPFD: This is great for seedlings, clones, and mother plants. (taken from https://growace.com/blogs/learning-center/why-is-par-rating-a-big-deal-for-indoor-grow-light-systems)
If I look on the PPFD map of the TS600, that leads me to conclude you should hang your light at +-50~60cm in the first weeks, slowly lowering it if it is not showing signs of stress.