Any time you put dissimilar LED's in parallel, you need balancing resistors to insure that the higher voltage ones aren't starved for power. If you have a high enough voltage available, it's possible to run them in series, then you can just use a single current limiting resistor for the whole string. If you're running from track power and using the 20110 LED Lighting Regulator, no resistors needed, just wire the LED's all in series and adjust the intensity with the pot on the regulator board. The 6V lights, OTOH, will need their own source of power, which from previous posts here I think you have covered with your adjustable voltage module.
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