Making your purchase might be more confusing than ever.
What Nits and Lumens Are
Here is how Nits and Lumens are defined.
Nits Think of a TV as like the sun, which emits light directly.

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Lumens Lumens is a general term describing light output for a display.
Nits vs. Lumens
One Nit represents more light than 1 ANSI lumen.
The mathematical difference between Nits and Lumens is complex.
If you want to do the reverse, divide the number of Lumens by 3.426.
Getting more precise, other factors, such as TV screen size also affects the Nits/Lumens relationship.
However, where does the term Brightness fit in?
However, when considering light output, here are some guidelines to keep in mind.