headlights.... leds,halogens,hids,projectors etc ect

[sinto607276]

All the places I've Emailed or called, have all  suggested the +/- wiring to power as it reduces the chance of flickering, you are right in your thoughts that it'll work without but it will flicker as the power isn't sufficient enough through the normal wiring as it's a dual element bulb and unlike the H1 bulb in that respect.

Try typing "h4 hid wiring diagram" into Google

All the H4 HID kits I've looked at have all had the extra wiring with an inline fuse, why would you not want to use it?