Originally Posted by OldMac
As to the frequency that this pulsing must occur, it probably doesn't matter, we are not trying to fool the human eye just get photons to the plant. What might be more improtant is the ratio of the on and off, but it is going to depend a lot on thermal management, which brings me back to the point of that being an old paper. They where useing 5mm diodes back then, we are up to some serious hi power LEDs now, so the thermal dynamic issues to pull off pulsing is now much different.
You are quite right, OldMac.

I measured my TI Probloom with my newly acquired LUX meter.
At "Ground Zero" it measure Over Scale (400,000 LUX)
At 1 1/2 inches it's 396K LUX.

I'm gonna do a much more in-depth measurement when I can set up a rig that makes it easier to tak the measurements and then publish the results along with measuements on the output of the procyon. I'm also curious as to what the level was in my grow room so I'll publish those as well.

Later,
MP