Question About Rear Bumper Lights

[tower]

With a good deal of help from Hucky (thanks, Guy) my rear bumper lights are ready to physically install. They have bulbs with 2 filaments, a bright one and a dimmer one. I assume that the dimmer one is for use as a park lamp. Could anyone with an '05 or better please let me know if the brighter one is for brake, turn or both and does this apply with park lamps (or headlights?) on AND off? I am trying to figure out the wiring and fear I may need diodes and relays to accomplish the factory functions. Thank you!