If you just want the LEDs to light up and don't care about other effects (flashing, brighter brakes, etc) forget the tamiya light units. They are large, heavy and overpriced.
Tamiya LEDs are usually two 3V LEDs wired in series*, so they take 6V per string of two lights. You can connect them directly to your receiver. If you want to run multiple strings of two 3v lights, just wire all the strings in parallel to each other. Each string of two LEDs will have one positive and one negative at the connector end, just connect all of the black wires of the strings to each other and all the red(or white) wires together, then wire them to a plug that will fit in one of your receiver channels.
*Any string of two 3V LEDs wired in series will work. Four 1.5VLEDs all wired in series would work as well.
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