I just saw this thread and references to our "kirban" headlite system so I want to clear a few things up. We sell the plug and play upgraded harness by itself which allows customers to go with any H4 headlite they want to go with. Our harness is custom made for our cars. Another company makes a generic harness and we worked it out with them to make it correct for the G body applications. The key being it has two 80 amp relays in the system that can handle up to 100 watts.
Your stock sealed beam format is very outdated. Turn your low beams on and then flip to high beams notice your low beams dim slightly and are not nerly as bright as your high beams. The headllites we offer are the better H4 formats. The low beam is now as bright as the high beam and doe snot dim when the high beam is activated. Granted many choices exist, we found one that looks like the factory sealed beam reason we offer that one. They come with 55/60 H4 bulbs already installed which puts out more light than stock.
GM changed the wiring when they went to the 4 by 6 format which makes the stock headlight harness marginal at best and simply upgrading your headlights may cause problems with your headlight switch without soem sort of upgraded headlight harness. Also the upgraded harness has all 3 prong plugs which eliminates the need to bend the cener prong on an H4 headlight for the high beam in your car.
I talked to several sources and they refuse to carry HID systems because of issus with them and the fact one system doesn't work across the board on every car.
Our upgraded harness is under $70 on our website and can be bought by itself which allows you to buy any H4 headlight you desire. Our company is looking past this as we also have them for the 5 3/4 round headlights and the 7 inch round 12 volt lights since we market many products to other companies as well.
This harness was not made by Caspers but was an existing harness from another source that has sold thousands of them we merely had it modified specifically for our market.
Since it can handle up to 100 watts I would think that would be more than enough light for most applications. I do not know why it won't work with HIDs just that it won't. The HID format was never my targeted market.
Also this same supplier will soon have halo style headlights available which as you know is the latest new gimmick on the upscale cars today.
We will have the new headlights and harnesses available next week at the GS nats.
denniskirban@yahoo.com
for some reason I thought I had typed this post earlier but it did not appear in this thread.
How the harness works your headlight switch is merely used to turn them on and off power is then transferred to this wiring which is designed to handle the higher watt bulbs.
Without the upgraded harness you may or may not have trouble with your factory headlight switch but its a risk that can be a dangerous issue if you use your headlights for nite time driving.
. Haha. The ones I had had 2 194 bulbs that shined behind the reflectors for the h4 bulbs. Ill take some pictures of them as I still have them kicking around. Basically lit up the edges of the rectangle housings. They were Alittle cheesy in my opinion being they had blue bulbs for the halos. Maybe a whiter bulb would have looked better. 
