Thanks for the responses,
I know nothing, just what I play around with and research.
I think I understand the basic concepts of transistors and mosfets, and that mosfets are better utilized in conjunction with microcontrollers.
I will research what you mentioned silver serpent .
The main reason I am looking at this option is because I was able to fully power the one Xp2 cree die off the speaker ground (as if PWM...) while the 3w single die led still ran off the LED grounds...
I'll see where it takes me.
*edit quick google fu-has led me to the answer. Pull down resistors as mentioned by Silver Serpent*
http://hackaday.com/2015/08/17/you-c...ld-dead-hands/