Ron045,
What drove me to the LED conversion?
I currently have 12 8-car passenger trains and two 6-car El trains running, 6 of which consume power on my layout at one time. Also I have several lighted cabooses on my layout. That's a lot of current flow from my single Z4000 power supply, and I need more than 50 LED conversion circuits.
So the bottom line reasons for my do-it-yourself LED conversions are to reduce the current draw from my Z4000, and to make the cost of the conversions affordable.
Next I will be converting the 14 switch controllers and switch lanterns that draw track power too.