I'm getting good growth under my 300W unit. It's the same as the 165W, just double the size for larger tanks. I'm bad at documenting coral growth with pictures, but I have some good examples of one coral that was on death's doorstep and is making a great recovery.
For a little background, I got this coral as part of a 10 for $99 SPS pack on Ebay. It arrived brown and drab and slowly declined over the course of 2+ years. I was living in an apartment and didn't have much time or space to improve water quality. Eventually it was down to probably six actual polyps still living. I almost wrote it off as a lost cause and tossed it in my sump, but I'm really glad I didn't. After I moved last year and got the water quality better, the thing started growing and encrusting its dead skeleton. A few months ago I transplanted it to a frag tile and it's been growing great ever since. It's developing some really nice blue/purple coloration around the tips. All growth under Viparspectra lights. I can't wait to see how this thing looks when it's grown out.
Here it is on 6/11/2020 right after I glued it to a 3" tile. I cut what living tissue was trying to grow off the mostly dead skeleton. It broke during the cutting process.
Here it is about two months later on 7/29/2020:
Here it is again a month after that on 9/11/2020: