My min range was set to -70 and max range of 5000. It says not to change these values but I think I'm going to play around with the min range tomorrow.There is the ability to adjust the range but I would not attempt it without a solid reference to compare to.
Addendum: So I changed my minimum value to -40 and the PAR reading that normally hovers around 100 at this time of day had jumped up to 130. I've now adjusted the minimum value down to 0 and PAR has jumped up to around 145, so suffice it to say I think the PAR reading is now within ±10-25 of what the Apogee MQ-210 probe was measuring.
Addendum addition: I'm now finding that I get a PAR reading of ~50 at night even after the moon lights turn off - so there must be some ambient light source leaking in somewhere (or the sensitivity is just too high).