Previous MacBooks with the glowing Apple logo achieved the effect by simply having a cutout that let the backlight of the LED display shine through. It used no extra power, however external light could shine through the logo, causing a bright spot on the MacBook’s display
However, the new 2026 MacBook Pro with PROLED XDR Display has an OLED screen as the name implies, which doesn’t have a separate blacklight. This means the logo will have to be illuminated independently. I wonder what the impacts are on power usage and if it will be controllable in macOS.