Cool! Yeah, that’s likely a good margin on those adapters-- thanks for biting the bullet on that! I went back and re-read the PAR discussion thread from a while back. I had looked at/tried some of those ideas (and the LEDGardener forum shut down that had some other DIY-PAR sensor concepts), and still think an Apogee quantum sensor will be my next upgrade-- but I’ll wait to hear your feedback. Thanks!