Switching between Emacs color themes

Emacs has lots of different color-themes. Depending on the light and my own mood, I would like to change between my two favorite themes, the “standard” light theme and a dark one.
This is the color-theme I use for my LaTeX files (“sitaramv-nt”):
But for my model files, I like the dark color-theme (“dark-laptop”), but sometimes the light one.
I searched the internet and found some code that allows me to switch easily between the themes using F11:

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