A new 2 item set consisting of:
1. shelter light
2. advert board light. Both can be found under Lighting / Outdoor Lighting, both cost 0.
Use the cheat "moveobjects on" to place the 2 lights.
NB. make sure that the advert board light is placed in the right place as per picture. Its only meant to light the outside advert. The inside advert gets it's light from the shelter light.