If I were you I’d just 3 max for a 5x5. The one thing I learned about the led lights since I switched over, is they don’t penetrate as well as a hps. You will see allot of the newer fancier ones tend to spread them out In rows, like panels all connected. They were telling me at the hydro shop that panels were the future and finally caught up with the old technology. From what I gathered its better too spread the light like pur 3 or 4 descent leds around., opposed to one huge light .
This is just my opinion
they don’t change spectrum but you can dim them,