@fanleaf , I was looking for LUX to PAR conversion tables and I found a multiplier for the CREE 3590 3000k cobs - it is 0.014953846153846
Multiplying this by the last LUX reading of 25,000 lux, my PAR should be close to 374.
According to this chart:
PAR values
cuttings 60-90 umoles-
veg -300-425 u moles
flowering 700- 1,200 umoles
I am right where I want to be. I already knew that... but, it is nice that the numbers back me up.
A figure @Mayne gave me a couple of years ago is 67. PAR = Lux/67. This is 0.0000285 or about 0.2% off from the value that you are using. It's nice to get independent verification.