Greetings and Welcome Aboard BonsaiNut!
Trees brought up under artificial light need to be eased into sunlight, particularly if kept indoors. This means to slowly introduce the tree into “real” light.
Likely the leaves got “sunburn” The tree just wasn’t used to the intensity…
The next question is will the tree recover? That’s problematic. Given the tree has enough energy and proper watering, it’s possible the tree will recover.
btw; Please do us a favor, double tap your icon atop the page, the account details then scroll down and enter your approximate location and USDA Plant cold hardiness zone.
Thank you!
Cheers
DSD sends