My shitty Vipar run. It takes damn near as many real watts as HID but they grow bomb fucking weed, and plenty of it. 570 watts over 3x3, yield...I don’t know or care, lots.
I like COB and Quantum-type boards and strips for different applications, but sometimes good enough just is.
I will eventually build or buy both quantum and cob setups, but I do fine with HPS, Vipar, fluorescent, you name it. One must merely throw a lot of damn photons at them, they don’t care how. I use HID to partially heat my house at night and LED during the day. I love winter because I can grow 2x more with no damn AC.
I am doing 12 plants in DWC under these lights next run in this little tent. Zero veg clones, no media. It is going to be epic.