Anyone experienced leaf burn from a high intensity...

Hi @stevieb21! Yes this is a common issue, especially with such powerful lamps. Affected leaves won't recover and the yellowing will get worst, so you can tuck the leaves out once 40-50% of their surface is burnt. However, I have doubts regarding your symptoms, light burns usually don't look like this, and are are often accompanied with curling upward leaves, or other symptoms on the buds (bleaching, foxtailing..). My bet is that you overfed your babies and probably also overwatered the containers. Your medium looks really flooded with water on the video and your EC is extremely high. This leads me to think that your coco has become too "hot", resulting in nutrients lockout. This would explain the brown spots, the purple stems, and the yellowing. The rootzone is unable to manage Phosphorous and Potassium intakes. In this scenario I would give it a good flush with plain pH'd water before going back to a reasonable feeding schedule. Time is essence here and the quicker you'll react the best chances you'll have to save your crop's quality & quantity. Hope this will help, keep us up-to-date and happy growing 👊