The object of this comparative flood-light test was to determine the system of ground flood-light equipment best adapted for service use as night-flying equipment. From the results of this comparison recommendations were to be made for the equipment of Air Corps flying fields according to a standard practice. The desired standard was to be installed at a reasonable cost and to be of such a simple nature that various municipal and privately owned fields might readily follow the Air Corps standard. In time of national emergency it will be of unmeasured value to adopt such a standard practice in order to readily transport aircraft across the continent in a minimum of time. Flood-light equipment is considered as an emergency ground aid to supplant the landing-light equipment on the airplane in case of failure of the latter or in case the airplane is not properly equipped. It is necessary that the emergency ground flood lights meet requirements which are arranged in the approximate order of their relative importance: (a) Safety; (b) Reliability; (c) Adaptability; (d) Controllability; (e) Cost; (f) Supply.