I'm sure you will get better advice from someone who knows more than me about making sparks. First its 12volts not 250volts, get rid of that fuse. 2nd I don't know the amp draw of 150 led lights but they don't draw many amps. I think your wiring is most likely grounded,to be blowing fuses. Keep putting in bigger fuses, and you will burn up your wires. If it worked with the original fuse, use that same size.Get a meeter and start checking. If you don't know how, find some one who dose know how. Don't risk melting your wires, no shame in saying I don't know how, but turning a problem that can be fixed with 6 inches of tape into a rewire the bike problem can ruin your day.