Lmao, looks like we got a fish on the line! I've never bothered with HPS or HID lighting in general, but I see and agree with what you're saying.
Unlike those whom will lose sleep over those few percentage points of light their lamps are putting out, I'll sleep easy knowing my plants will be demonstrating their yield under a tropical sun.
Of course I prefer to look at MJ plants rather than an electricity bill
but worry not, those extra $15 a month will be offset in no time. On top of that, it's a huge step forward from my Cree XTE warm white lamp I built a couple years ago.
I'd enjoy reading about why that extra "630ish" wavelength in lower CRI versions would mean more yield. That also must mean you have a spectral distribution chart/graph for v2 V18s @90CRI (I've been unable to find one)?
The plants will be picturesque under my lamp, I'll capture that so you can rest assured~