Yes the Tideline, still waiting on it to arrive so I’m not starting a journal until I have what I need.
So I’d agree with you and the L was my plan as well. However, I always lean towards an island style scape as it’s my preference and being that it’s a central style, any light towards the outer edges of the tank is wasted and just food for algae. The Z400 or even a 900 model of the others will give me 36” of necessary light for my typical setup. I realistically don’t need strong light from end to end if that makes sense. That’s my thought process at least, and Week Aqua was on the same page. It also has the app features etc.