Testing LED intensity output?? PAR or LUX meter

[hillegom]

As Stircrazy said, apogee sells just the sensor which you hook up to a multimeter. One that reads at least 0-500 mV
Here is the manual:
http://www.apogeeinstruments.com/con..._300manual.pdf

And a good read
http://www.advancedaquarist.com/2013/2/equipment