On a CRT, which takes more engery?

Question

This is earth day and cities are blacking out for an hour. Google has changed it's color scheme from white to black.

On a CRT screen, though the energy difference would be small, would it take more energy to make the screen black or the screen white?

Answer 1

black uses less energy

Answer 2

more energy to make it white.  the electrons fired usually make up red green and blue to make white, however to make black the electrons are just at a different frequencey so noo need for mixing electrons.