Welcome to the community.
I am not sure how you are doing this. If the TV is the trigger it will turn the light ON whenever the TV is turned ON regardless of the sunset.
If you’re asking whether this blueprint will turn ON the TV light strip if the TV was already ON before sunset, then this isn’t the right solution.
Instead, you’ll need to use my 
Sensor Light Blueprint. With that setup, you can use the TV as the trigger and set the sun elevation condition. I specifically chose sun elevation over sunset or sunrise with time for certain reasons, which I explain in the FAQ section of the Sensor Light blueprint.
Using my Sensor Light Blueprint this is what will happen: If the sun elevation condition is met and you turn ON the TV, the TV light strip will turn ON. However, if the TV is turned ON before the sun elevation condition is met, the light strip won’t turn ON immediately. But as the sun sets and the elevation crosses your set point, the TV light strip will turn ON.
Hope this helps you.
Blacky 