Beginners like myself with these powerful leds definitely can benefit from knowing PAR. I burned a few corals for sure, even acros. Some pics of my homemade Apogee stick, works great once I got the angle correct. Maybe not as precise as some, but the general PAR numbers keeps me out of trouble. 1/2” pvc, small piece of acrylic, a little whittling and some glue.
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