I have Cibie 7" E code halogen headlamp conversions on both Vixen and Gladys. I put
@crackedback's relay and harness kit on Vixen and already had one on Gladys before he started selling his. I had an 08 Jeep Wrangler. Why anyone would want those headlights is a mystery, as they were some of the crappiest new vehicle headlights I've ever seen. The Cibie E codes are not DOT approved, but neither is any LED headlight in our older cars, either, so going either way you are really not legal so keep that in mind. With all but the totally crappiest headlamps out there the biggest things to remember is getting the proper voltage and current to them and aiming them properly.
@slantsixdan has a very good web site regarding headlamps, bulbs, relays and aiming. Probably the best, IMO. Just look around. There are all kinda of interesting things called FACTS regarding lighting on Dan's web site.
Daniel Stern Lighting Consultancy and Supply
