By disable lights do you mean to turn the streetlights off? If so you need to fing the object IDs of the street lamps and use the code
{(object _x) switchlight "OFF"} forEach [1251,2003,28419,28420,28424,28664,32938,37326,66997,66998,67026,90863]
The above is what you need to for standard Malden to turn all the street lights off.
For your island you would need to find the street light IDs.
If that is what you need I have a script courtecy of Blanco that will help you find them