text: is there a law against how powerful and light your headlights are? is there any law saying how bright, powerful, etc. headlights can be.i want to get really bright ones but not get pulled over iirc, the maximum is 65 watts for on-road use, however the actual output will be measured in lumens or candela, as the wattage only corresponds to an incandescant buld, irrespective if it is tungsten or halogen (halogen is brighter per watt than standard tungsten)  so with the new xenon, hid (high intensity discharge) lights, a 10 watt hid is about equivelant to a 60 watt bulb.  you might want to have a friendly chat with your local police vehicle unit, or your local courthouse traffic dept.  having said that, i doubt police would pull you over unless you had what i had fitted to a 1951 classic car in uk, - 8"  200 watt sealed beam (12volt) (emergency airfield landing lights) but i did have a 100 ah battery installed  -  "oh baby!! the fields lit up like daylight "