Yeah I use PAR, but after trying to explain PAR, PUR and CRI to countless people I have given up trying, and if they want to use a dead measurement then I will give them my opinion in terms they will understand rather than spend an hour of my life that if will never get back trying to educate them...but once you understand PAR, and beyond that PUR and CRI you will spend much less time fretting over your lighting, and the slew of problems that inadequate or overly aggressive lighting can cause, and more time, trimming your healthy algae free plants :-)
Just worth noting, the WPG rule is no longer applicable due to so many different types of lighting available along with quality of reflectors. Speaking of Hoppy, he has put together a great thread on the subject which has been added to over the past couple years. You can find it HERE
I'm surprised you didn't realize that I was well aware of the Using PAR instead of WPG thread (I'm assuming that must be the link you posted), considering we had an exchange on that very thread today.
WPG hasn't really been relevant in 2 decades, due to the huge variation in the PUR of bulbs and quality of reflectors
It is only feasible if everyone is using the same bulb type, brand, color temperature, shape, and reflector, which hasn't happened since...ever, but maybe in the early 80s or late 70's things were a lot closer to being the same, as there were a lot less manufacturers and options from the manufacturers that did exist in the hydroponic and aquarium lighting communities.
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