Hey buddy,
I use the same mix, and I've also grown royal gorilla before so if you need any tips or what not feel free to check out my Royal Gorilla grow.
As for the light mix, you won't need any nutrients for at least the first 4 weeks. Maybe more. I suggest if you do, start off on 0.5ml per litre with the advanced nutrients. Then work your way up. Using the recommended dose of 4ml per litre will ruin your plants. I use advanced nutrients too an I swear by it. If you take your time your results will be spot on, always remember less is more. You can always add extra but you can't take away. Just a heads up. Hope it goes well for you.
-Flavoursuk 😎