The visible light there is from the UV emitter now looks cyan, while the IR beam that normally isn't visible at all looks the way the UV emitter's visible beam does to the naked eye. This tends to happen because the RGB filter arrays used in consumer digital cameras are only designed to filter visible light.
An elected leader is chosen by a vote of the public, while an appointed leader is selected by another leader or a body of officials without the public directly participating. Both types of leaders have been important in American history, particularly in how they exercise their authority.
At-large is a designation for members of a governing body who are elected or appointed to represent the whole membership of the body, rather than a subset of that membership. At-large voting is in contrast to voting by electoral districts. If an at-large election is called to choose a single candidate, a single-winner voting system must necessarily be used. If a group of seats must be covered, many electoral systems can be possible, from proportional representation methods to block voting.