How to turn lights on at key moment?

Hi. I created a very simple exterior day to night scene with just two key frames, and I simply want the lighting layer to activate at a particular moment but I only seem to be able to have them on or off for the entirety of the clip. I tried selecting the second keyframe and turning the lighting layer on, but they just appear right at the very end as the clip ends.

hope this explain u how to do this.

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Thank you.