How to go from Pitch Black to Light

I’ve got a sequence that turns lights on one by one, to light up a warehouse.

I have set the sequence to adjust the intensity of the stationary lights, to turn on. Works great. However, when all the lights are off, the scene is still dimly lit…how can i have this completely black?

  • If i ‘build lighting’ with the lights all at 0 intensity, the room is nice and dark, but when the lights turn on, they do not fill the room in the same manner (its like the ‘scatter’ of the light isn’t calculate in the same way to the ceiling of the room itself is still dark)

  • If i ‘build lighting’ with the lights all at their full intensity, the room looks brightly lit and all perfect when on, but the room also remains dimly lit when the lights are off.

How to I resolve this? Many thanks!!