For a 5x5 the easiest would be getting about 9 qbs, either hlg or other cheaper versions exist. Put them on some alusheet, 3mm and about 2-3 inches larger than the qb. Put them on 3 hlg185s or other 200w drivers and frame them in rows of 3. It will be slightly light on wattage. But theres appint to that, i dont think no-till is a good medium for a maxed out led setup as you wont be able to control nutes as well as in hydro.
Cost of this would be around 500$ plus alu backing frame cables and wagos, if you go the china way with the boards.