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How to connect a bulb to a video door phone? Answered

The video door phone uses four wires and it is connected with an 8 core cable, that leaves me with 4 free wires. What I want to do is connect a bulb somewhere in the middle of the cable so that when the doorbell is pressed the bulb is swiched on and off again when the screen switches off after about 8 seconds. Thanks in advance


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