You asked for info, people offered their opinion as you asked but you get extra negative because its not exactly how you wanted that info phrased...weird. To me the replies and opinions are based on experience so they may OR may not be valid but those who mentioned overfeeding were saying that because if overfed it can lead to WHAT YOU ASKED ABOUT WHICH WAS DEFICIENCY! Overfeeding can create a hot soil which will lockout the stuff your plant does need and cause it to show symptoms like the ones you posted...idk if you've read the MULTIPLE replies suggesting you "back the lights off" but I know i added that into my reply AFTER reading others tell you to raise them up off the plant. THERES LOTS OF KNOWLEDGE OFFERED TO YOU IN THIS POST, I took some from it so rather than be mean or rude, maybe be thankful these people took time out of their day to comment on your post, and if you knew it was light burn, then why ask for opinions? If it wasnt that you needed help and you just wanna post pics or comment, I'll throw ya a

laughy face

or two as long as you try to be nice.