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I don't know why GM didn't want all 4 headlights on a once when the high beams are on. I guess there was some federal regulation that prohibited them from doing it. Maybe they were afraid too much light on a two lane road would completely blind an oncoming driver? That could have been the reason the emergency vehicles could only put out a certain amount of light. The headlight circuit for the truck headlights is super simple. It would have been easy for the factory to turn on all 4 lights if they wanted to. When you turn on the headlights it picks up a headlight power relay that sends 12 volts to all four headlights. There is another relay that has two sets of contacts, one normally and one normally closed. That high/low beam relay switches the ground for the headlight bulbs between the low beam contacts (default) to the high beam contacts when you click the dimmer switch. What I did was remove the headlight assembly (five minute job) and connect a short jumper tapped into the low beam ground wire near the low beam bulb and grounded it to a bolt about a foot away. With the low beam bulb constantly grounded with the jumper the low beam bulbs burn anytime the headlight switch is on. When you click the dimmer switch the high beam bulbs receive a ground through the high/low beam relay and the high beams come on. As far as multiple elements in a single bulb... my LEDs have three 3 elements on each side of the bulb for a total of 6 elements. The light that comes out of the headlights actually comes from the side of the bulb and is reflected down the road by the silver/chrome coating inside the headlight assembly. If all the elements were facing forward in a line you wouldn't be able to get the bulbs through the hole designed for the OEM bulbs. I read that the perfect retrofit bulb would emulate the OEM bulb as much as possible so it would work well with the reflectors in the headlight assembly. Sorry about writing so much about my truck. When my fingers get started typing they are sometimes hard to stop. ?

Welcome to the forum! Great looking Reatta.

New kid on the block