Totally random but the guy who built my 6 watt blue told me a while back he could build a 50 watt laser rifle. I’ll have to look up the video - he arranged the diodes so that the beams combined somehow.
Have you guys seen the white lasers? Styropyro had a setup where he merged a red, blue, and green beam (I think…) and the beam looked white. Maybe that could bypass the need for the phosphor altogether