That is the problem.... A 250 watt incandescent would draw approximately 20 amps.... Keep in consideration a standard 7 inch incandescent sealed beam headlight (not H4) is rated at 60 watts and draws about 5 amps...
A really big issue I'm having is most LED light system do have illumination patterns in literature, I am torn between "Fog Lamps" and "Driving Lamps" on ,my Jeep....the funny thing is lumens and watts should corelate, but they don't, so you don't really know what you are getting until you install them and fire them up.... I put a utility LED flood lamp low on rear bumper of my Jeep to augment backup lights in tail light assembly, now I have 4x the light in rear, not real bright but enough to see better.... And I didn't even have to change the fuse for backup light circuit...
Dale