Emergency lighting provide safe, reliable illumination during failure or interruption of power, as well as distinct, highly visible exit marking to indicate the direction of travel to exits.
Emergency lighting that are internally lighted operate in much the same way as emergency lights. Because they stay on all the time, many of them have two sets of bulbs. One set, that is normally on, operates on 110 volt building power. The second set, which comes on only when there is a power failure, are low voltage bulbs that operate on the battery only. Therefore.