120 volt xenon bulbs are fully dimmable just like a regular incandescent bulbs, using regular old 120 volt dimmer switches.
The output of a 120 volt dimmer switch will be an AC voltage so should not be used on a DC motor.
No, the voltage rating of the switch is too low.
Yes.
Yes, but a fact has to be taken into account that when a 230 volt rated bulb is used on a 120 volt system the wattage output is half of what the 230 volt bulb is rated at when it operates on 230 volt. So the dimmer will only be used to control half of the bulbs wattage which could bring the bulb down to a dull glow in full dimming position.
If you want your bulbs to last longer then use 130 volt bulb on a 120 volt system. The light emitted by a 130 volt bulb, when comparing it to a 120 volt bulb, will be a bit dimmer.
Kyle Design
15 amp
No, get a matching transformer and check the polarity and the milliamps.
i know this will sound silly but first make sure the headlights themselves are not blown.you would be surprised how many Kia's come into my shop with headlights not working and all the headlights are blown. after that get a volt meter and disconnect the light and test to see if you have power , remember the dimmer switches are famous for cold solder joints and will also cause this problem.
You can buy 6v photocell dusk to dawn switches from Acetek photocells
6-8 hours