Apogee SQ-420 vs SQ-520 for LED's

Peter K · Aug 11, 2019

Hi all,

So I'm really wanting to get a PAR meter and was looking at the apogee usb ones, but I run only LED's so I was wondering if the extra $100+ for the SQ-520 is worth it over the SQ-420. I have seen reviews where they say the margin of error isn't that much different or there is a correction equation can that be used. Does anyone have experience with the SQ-420 on LED's?

Thanks all!

Peter K · Aug 12, 2019

uttermann · Aug 17, 2020

Looks like a recent thread on the topic here that got more traction:
Apogee SQ-420 USB Par Meter | REEF2REEF Saltwater and ...

I'm leaning towards the SQ-420 myself. Looks like the biggest area of concern is in the ~400-450nm range where, the SQ-420 response drops off significantly, however in BRS's testing they showed that even with a very blue light the response was only ~12% low.

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