As was said ... DC voltage ( 12 volt ) , and those LED's would be best --- IF --- they are bright enough ( how many lumens or mcd's and what angle are the LED's ? angle is important due to that you do not want a wide angle - the smaller the angle size/number , the more the light will be focused outwards , rather than to the sides . So small number for angle , large number for mcd's , or lumens )
Otherwise , you could get a single ( filament ) bulb ( regular bulb ) that has a rating of 50 watts , or a pair of them , for a total of 50 watts ( filament bulbs are rated differently than LED lights are . The higher the wattage number on filament bulbs - regular light bulb style , the brighter the bulb , BUT , it will also suck up more amperage/wattage from your stator . Now , with a LED setup , I doubt VERY much you could ever get too much LUMENS to even come close to straining your stator ( the stator - thats the doo-hickey thingy ma-bob jiggy that produces electricity so you can have lights on your quad . )