I believe I read some place that Neptune uses an Apogee 210.
If you look at the chart, the 210 is considered an original, so use that graph line.
I have the new SQ-520. It reads the blue spectrum better.
https://www.apogeeinstruments.com/aquarium-par-meters/
BRS did some testing.
https://www.youtube.com/embed/A1F3IQ...owinfo=0&rel=0
https://www.youtube.com/embed/6hUkuf...owinfo=0&rel=0
https://www.youtube.com/embed/62_FdP...owinfo=0&rel=0
__________________
Pete
"I never make mistakes...
I thought I did once, but I was wrong"
Current Tank Info: In the process - http://reefcentral.com/forums/showthread.php?t=2661614
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