Lux will depends on your light type that’s where you need to use wave from lighting converter to transfer it into PPFD and then into DLI.
It’s all laid out in the first post
My lux is anywhere from 22,000 in veg for my 3500k while running 20hr of lights, to 56,000 at 3000k Durring flower for 20hr
If your running 18hr your going to want even more but yeah it’s all there any specific questions ask but you need to know the Kalvin rating of your light and plug all the info into the converters