The searchlights can be done, the lightning effect will however be not, or barely visible - as you pointed out previously - we allways have day in civ. Fire cen be better seen at day. However, as your idea assumed electric light rather than fire... Maybe some odd neon light construction - like some old neon store-signs etc. put together to a "monumental" light-sighn. It would be similar to the Broadway building - the neon there is not very stiking, but noticeable.