Good news, I would not panic👍.
From your grow details and your current environment I would do two simple things. Back that light off a little more. I know you're only operating at 100W right now, but being an LED and with it's relentless intensity for 18 hours a day, the girls just start to get pissy. Suggest turning the intensity back to manufacturer specs and raise the lamp to mitigate the intensity. I always find it easier to move a lamp on ratchets then to change integral settings. You have plenty of room, so finding a sweet spot for this lamp at this stage of growth will not take you long at all (From the lamp you're using, you're probably looking at a 60-75cm buffer space (24-30 inches).
Second is just a nice full, balanced dose of nutrients with whatever early Veg schedule you're using.
That's really it, actually. Plants are just fine, just stressed a bit and those white specs are good indication of bleaching from light intensity. I hope this was the answer you're looking for my friend. Definitely don't have anything to worry about, just need a couple tweaks to the environment. You good👍
Cheers and happy trails. Contact me in PM if you feel like there's anything else I MIGHT be able to help you with. Cheers!