No one had more than 2 w/gal back when we first got some.
Nothing to do with showing off.
It grows too fast in higher light and piles on top of itself, not longer being a short turf that looks orderly.
4x 65 w is good for a 120 gal tank(4x2x2) or so.
I'd suggest you use less, not more iof you want to keep some of these plants and have them grow at rates that allow you more control and more wiggle room.
Get as much as you can, but plant in 2-4 leaf pieces about 1" apart, it'll fill in about 2-4 weeks time.
Regards,
Tom Barr