
So long story short, I've been using a blue lab guardian for a couple months with my dwc grow. Best purchase ever made btw
But after switching to my hortilux gold series ballast the ec would rise from 1.3 to 1.6 after lights out.
So my ec has actually been at 1.6 all week

Switched back to my nanolux ballast, reads 1.6 like it should be.
Rf interference
Big shout out to Nanook for helping me figure this out

Happy growing
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they've actually been in contact with me, they asked for a video of it happening and the serial number of my unit