The best way would be to use the state option in night lights. Then create a toggle helper. The toggle helper must be ON at all time except when you would like to change the lights to 100%. Then you must also use another night light condition.
Then select “If lights are ON, adjust the lights when crossing over”
If you would like the toggle helper to automaticity come back ON when you turn it OFF, use this blueprint 
Entity - Run ON Timer if you are unsure how to do this. You can have it OFF for X amount of time for when you leave or enter to then return to night light mode if all night light conditions are met. In the “Entity - Run ON Timer” Select OFF state option for the trigger and enter the time you would like.
Now when you turn the toggle helper OFF it will go to normal lights. If you used “Entity - Run ON Timer” blueprint the toggle helper will be turn back ON in X amount of time and resume night lights mode. When your other night lights condition is false then normal mode will be activated.
Hope this helps, and let us know how you go.
Blacky 