I'm going to venture a guess and say you're light is pretty high above the plant if so bring the light or plant to withing 16 to 18 inch of the light and if you can turn down the intensity to about 50 percent for a few days and then slowly adjust the intensity if you can't just turn it up full and lower the plants a couple inches or raise the light
I good app for PPFD is tent buddy, it had a PPFD and DLI calculator also has a VPD calculator as well, great app just keep those numbers in the parameters and Bob's your uncle