Light Posts are civilian structures found in both Campaign and Skirmish (when applicable).
Light Posts are used to provide light sources on the battlefield. In generated maps, they spawn when the time of day is set to Dusk or Night (or if the Transition option is turned on). When in-game transitions are active, the light posts turn on/off in synchronization with the in-game day/night cycle. Light posts come in two forms, Light Post and Alpha Light Post. Outside of their names, they share no noticeable differences in function or appearance.
When loading a game that features transitions, there is a chance that the light posts will remain active indefinitely; making their surrounding lit areas almost blindingly white.