I just manage to get hold of a Par measurement tool.
Apogee MQ-500
This is the Light Schedule for my tank
This is the outcome of my Par Measurement for my tank
*Please note that when we using the sensor...please note that there is some compensation to be made for the underwater usage.
Quoted from Apogee Website:
Underwater PAR measurements collected using a full-spectrum sensor can be corrected by multiplying by 1.32; measurements collected using an original Apogee sensor should be multiplied by 1.08*.
It is all part of reefing to make things nicer and better