You guys are overthinking this. There was/IS a “bulb” used and it was the one in Poita’s scanner (Or TeamNegatives). The difference is in the color temperature between his bulb and the one used in the 70’s… ala white balance… and the only difference is if he scanned it with an LED lamp, or if it used an incandescent. The differences are known temperatures and IF it’s that important as Dr. Dre said that would be a final LUT applied to the entire movie once everything else is done. What you’re going to get though is Stormtroopers that are mildly yellow though, instead of mildly blue. The primaries are going to be largely unaffected.