Quote Originally Posted by DreadedHermie

Two way different animals. Sorry, you're not going to get "pulsing," as the term is bandied about here, out of a PWM dimmer. Hope this saves you some aggravation.
Hermie,

I did not mean to give the impression you could get "pulsing" from a dimmer, but that a dimmer produces a square wave that is more efficent to the diodes then a sine wave.

It is a starting point in understaning the pulsing concept tho, rectify the output, double the amplitude of the remainder and you effectively have the same power with 1/2 the time being on and 1/2 the time off.

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.

Remember there is no "free lunch" here if you get x number of photons per watt (or mili or micro), per second (or mico or nano) and you want the same number of photons in the same time but some off time then power must increase. The proposed pulsing theroy is seeking to increase efficent use of electron conversion to photon energy for plant use, and much study remains to see how much could really be gained.