PAR levels high enough?


It doesn’t look like a TLS2581 to me…


Dunno it’ll be hard to tell until we have one in our hands, but I doubt they threw a spectrometer in their setup.


I ordered a Apogee Instruments SQ520…


Yep, based on the form factor I would agree it is not true PAR sensor.

Those, brave enough, may try to build DIY version based on this this description


This seems to be a solid sensor. I had looked at these before they had introduced the 500 series and hadn’t liked the response around the 660nm zone, it looks like they have addressed it with their latest models. I’d be interested to see how it works out.


I just received it. I’ll get back to you guys this week.