Lights

I had no problems with 20% @24" high. I recommend doing the plugs and starting them in that and then transfer over to 5 gall pots. This way if your seedling gets a little stretchy you can plant down in the soil. I was really scared of burning them the first time,lol  But if you want too just plant directly into 5 gallon.... I don't do the cups to start seeds with these.. RH.... I do 65% during seedling and veg then in flower I will start dropping till I get to 55% mid flower and drop to 48 to 45% in the final 3 weeks . I use a quantum par meter so i never checked distance with a ruler . Remember also that around week 4 to 5 she will start to flower. She will throw some pistols out at 3 weeks maybe but she will be in flower at 4 to 5 weeks old.

If you are using a photo period feeding chart adjust to the life stage of the plant. 

Good Luck ! Welcome to the world of Awful Flower lol.. Not really ... 😁