Light Unit : Fire department apparatus equipped with a generator, flood lights, and electrical tools for use in night fire fighting and rescue work; it is usually considered part of a truck company
Ralph W. Burklin & Robert G. Purington, Fire Terms: A Guide to Their Meaning and Use, National Protection Association, Boston, MA 1980 USA. (Guide: Meaning and Use, Nat Prot Association Fr Srvc - Amer) {457}