Id say they are but not diodes that gone thru QC as perfect top bin. They might sometimes be top flux bin but not lowest voltage bin which brings down per watt performance a bit. Or maybe a little bit outside tolerance limits for spectrum.
They do work fine though. But i wouldnt expect too much aftersales support. Id still rec hlg v1 boards though if they are still cheap.
Just under 2 but that was with Fotop boards: low watts (30ish per squarefoot) spread out very well over the cannopy, 8-10" hanging height minimizing wall losses. But that grow we must have had some luck, even the hps section finished 1g/w which we usually dont get. The secret is to push all envelopes: get spread right, spectrum right (i prefer 2700k 90cri for flower), plant health and we had shit loads of co2.