First Grow Don't Know

Little burn on the tip of a new Pineapple Chunk leaf. I raised the lights 2 inches and bumped rest/dark time to 6 hours from 5.

Light burn typically doesn't happen right away. Unless your lamp is right on top of the plant but it doesn't seem that way based on your metrics and some info found on your light on the internet. My question is, is it the photo or are the leaves that "yellow" in the photo? The prior week, the little gal looked pretty healthy. Looking at your prior weeks, I see you are fertilizing with Grow Big as well. That is most likely the cause of the "burnt" tip. The soil you used should be good for the first 3-4 weeks of growth and maybe supplement if you know the plant can metabolize the nutrients. Not all strains can take nutes as per the "recommended" dosages. Otherwise, you will see signs on the tips for nute burn. If you feel that's the case, I would advise just using plain water for the next couple of weeks to stabilize here and if it gets worse, I would recommend a flush.

Best wishes bro! 👍 I’m in late 🌸 4 strains, check out my chemical bride 📔 thanks!

Enjoy growth mate 🤘🍀🦄

Wish you best of luck and happy growing 👌👊😎