Everything you said is correct. Yes, one driver with one plug that runs four bars. You also get one WiFi controller. You pick the bars individually, so if you wanted, you could get four colors. I’ve bought two sets of these now. One set was two bars at all 450 and two with a range of blues. The other set was two bars with a range of blues and two with a daylight spectrum.
Yes, the driver gets hot when the bars are cranked up, but that’s not surprising. My Orphek drivers in my V4s got so hot you could barely touch them . And yes, the bars get pretty easement too. I have a fan that plows across my driver and all of my coralcare fixtures that keeps everything cool.