"switch off the light" is correct and can be used in written English.
It is a common way to ask someone to turn off a light. You can use it when you want someone to turn off a light that is currently on. Example: "Before you leave the room, please remember to switch off the light."
The given Zt's were selected on purpose, first, in order to take into account potential effect of diurnal fluctuations, which we know is generally very small based on the results of our parallel study (Koštál and Schöttner, unpublished results), and second, to allow comparing the transcriptomic responses to switch OFF the light (phase shift of dusk time).
For instance, when you move from one room to the next, switch off the light.
I switch off the light and leave, hanging around outside for a few minutes more just in case the name of the boy emerges, but it doesn't.
"Will you go in and switch off the light, Erik?" she said as people began to move from their seats and leave the room.
And when you put it down and switch off the light, instead of counting sheep, you could compile a list of great films in which sheep figure.
"We were taught to always switch off the light when you go and leave the room, and that you can only use water sparingly or to drink," Mr. Schwarzenegger said.
They are not required to switch off the lights.
As they switch off the lights, many Brazilians will also be praying to St Peter for an unseasonal downpour.
It's time to turn down the heating and switch off the lights – all this cosiness is making us ill.
By the end of "A.I.," though, there is no person left even to switch off the lights.
A control pad on the first-class seat backs allows the cabin crew to switch off the lights or close the window shades without reaching across sleeping passengers.
