One might imagine the replacement of carbon arc lamps by Laser Excited Phosphor (LEP) bulbs as used in some car headlights or some odd enthusiast flashlights. Or perhaps just a bunch of LEDs.

https://budgetlightforum.com/t/800lm-ebay-car-laser-lep-modu...

What is used for lamps at stadiums? Those are the brightest that I see these days.