Hey, welcome

I'm not too confident that you will get much out of 4 x 18w tubes... they might be good for vegging cutting but not for blooming.

Have a read of my grow journal. It the link below. I go from week 1 and document almost every week of my grow, sometimes every 10 days.

It will give you an idea of how you should be set up. It is loaded with pictures and info. I hope my grow journal will help. That's what it is for. I grow mainly with LED.

Take care