Kai;

When installing sealed beam Halogen equivalents, which are a nice lighting improvement for a very reasonable cost and similar wattage, I do not agree with OP for the reasons detailed here: http://www.sw-em.com/lighting.htm#relay_controlled_headlights

...and for the modest current increase to H4, from 40/45W (3.3/3.75A) vs. 60/65W (5./5.4A) a current increase which is well within the capabilities of the OE 122 Lightswitch (I took one apart recently and found its contacts to be beefier than the load contacts of the typical relays!!) and supply wiring, given that is checked and brought back to low resistance when new...this assures maximum voltage is applied to lights, and not dropped in little bits at every connection along the way (which is also eliminated when installing the often recommended relays...so it is NOT actually the relays which result in the improvement, but the installation of associated new wiring, crimps, and connectors!). Much the same can be achieved when cleaning existing connectors to shiny metal, and if necessary installing new crimps on shiny, newly stripped wire!...and assuring everything stays uncorroded with ACZP.

Cheers