John, do you know the temperature of your kit relative to current Lionel releases? I want to convert all my 2014 era Polar Express HWs (black roof) to match the new LED add on cars. Would definitely like to use your product if the color and temperature matches.
Typically, they're right around 3000K in color temperature, that's pretty much the standard "warm white" LED. I don't have any idea in what is in the Lionel cars.
If you want to select the LED reels yourself, just use the LED Lighting Regulator boards and use your own hand selected LED's.