You won't ever, really, be finished lighting the Ghostbuster HQ. You start with Rob's GBHQ lighting kit which comes with replacement Lego pieces fitted with lights. Sooo you have these extra pieces now which you can wire and place into the unlit places in the HQ's. AND as a result of the "plug and play" nature of these various parts you can forego lighting the slime on the sidewalk and pulse the red lights on the front of the building. Just finished installing  Rob's working stoplight kit that is so damned clever and it functions like the lights do here as opposed to Australia.