Light burn?

[Rierie]

I transferred my seedlings into larger pots and put them under one t5 light..came home two days later to burnt or.. used seed starter soil for seedlings..potting soil for transfer..but left the seedling soil in the middle..any ideals

 

[Billotto]

no ideal at all

 

[Busta Nutz]

Humidity or PH is my guess.