How do my girls look. Is my light close enough? Is to much perlite bad for plants?

Hello all my wonderful people. These are my girls they are in FOX FARM HAPPRU FROG SOIL. I give them 6.5 ph water. They are currently under knock off 2000 watt quantum’s boards turned up to half to why. They are about two weeks old and they were stretched when they were seedlings but they seem to be doing well. WHY DO SOME PLANTS ALREADY HAVE NUTRIENT BURN?

TEMP: 81-84

HUMIDITY :65-75%

LIGHT : 24/7

FOX FARM HAPPY FROG SOIL

2 weeks old