I match reading again a spiral cf ranging from 160 - 50 par by varying distance.
Your 1300 par reading sounds right. The par is calibrated for indoor light. It's the beginning of spring. You should get 1800-2000 at noon around July, remember the earth is on an axis.
I'll try a different light source next round just to make sure. I have a feeling it's slightly high but x2 or x3 is too much. Again, if you feel it's too much, change the pot to your liking.
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This meter pegs out at 1391 no matter how bright it is outside. Readings are two to three times greater than what a real par meter is showing me. Buyer beware, this meter is not legit. Sorry bro, I gave you a chance to come correct and you failed.