18 bulbs in 3 6 bulb fixtures and 5 X 5, when I wrote my first book, I said ok, gonna show ya how to get a pound off 2 plants, which I did. But mostly I don't care about yields so I do a lot of grows where nothing gets weighed, my grows are mostly about breeding and most of my gear are one hit wonders, take a look and check the smoke reports on page 2,,,
https://www.rollitup.org/t/are-they-done-yet-what-does-done-look-like.853978/
You can grow with those bulbs but less red and more blue is better, I use a lot of different bulbs and grow very differently than what you find in most forums
https://www.rollitup.org/t/light.853779/