I have a pair of “1500w” ones myself. If I am being honest, I finished my best plant to date with them (not on purpose, the situation required it at the time)… I think I did the last two or three weeks under them with a Blackberry Kush - that plant turned out great. They are nice for veg in winter when I need extra heat in my tent. This is my current veg tent lights:
Those are very similar to QB60s, and all combined they draw around 215w total (according to my smart plug).
I set it up so I basically have one board over each 2x2 quarter of the tent.
My intention when building that fixture was to keep it somewhat modular - I could easily bolt on four more panels and turn it into a pretty awesome flower setup.