somebody recently wanted to use a 30v power supply for some lights,I Think,you could drop the voltage to 18V by putting a 12V auto bulb in series with the load,the bulb would need to require the same amps as the lights. For ex low beam headlight is 7 amps I think tail ilight [1034;1154 about 3/4 amp each, not sure tho. Hope this helps
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