Welcome to this forum!
I agree with other posters about the HELLA 7″ replacements (they would be an improvement and upgrade), but I’m also sure they are significantly pricier than my first choice (when listed in ascending order of cost), which would be simply whiter Halogen standard replacement elements offered by GE (and I believe also by Sylvania,see: SW-EM Lighting Notes). An 1800E will have an OE Alt, so your Ebuss Voltage will be nice and high to power them well, IF possible Voltage Drops (which may be the reason you are asking about improving them in the first place), are minimized along the way…as 142Guy mentions (I typically very much concur with him because we both come from an engineering background, but actually less-so in this instance!), because I must add that the when not increasing Headlight Wattage (therefore current), the OE wiring, connections and components (when in proper shape and condition, and working order) are perfectly adequate for powering the Headlights (meaning no Relay solutions are necessary or required to improve Voltage applied at Headlights).
Only when increasing Wattage/Current by installing higher power non-OE Headlights should modifications be considered, and that only after power-up tests of the actual VDrop have been performed… More than once has an allegedly super-groovy relay power switching system for the headlights been installed (with brighter lights indeed resulting!!), but when this could have just as easily been achieved by maybe simply de-corroding the chassis connection where a VDrop was occurring!!…it’s called the shotgun approach and I don’t prescribe to it!…when changing everything and making it new (including the wiring…improvement results, so this must be the better way, and it becomes the recommended “upgrade”, when proper troubleshooting and simply returning the system to its original condition and function would have done just about the same damn thing…! [You will perhaps notice my strong feeling in favor of proper informed engineering opposed to the shotgun approach?]
…and as I just also typed on the Amazon subforum (so this is a copy) Finally, you should introduce yourself further, including your level of competence and experience, and always give as complete a description of the symptoms, preconditions and any changes from stock that you are aware of (as you have somewhat done) when asking for help…that way, posters who answer questions can give the best and most useful and informed answers and tips. You should also consider a Haynes Manual (best $20 a new Amazon owner will ever spend!), and checking into the other on-line resources where there is literally a world of experience available to help you up the steep learning curve and keep you from making beginner, potentially expensive (and unnecessary), mistakes.
Cheers from Connecticut!