Abstract

A luminaire housing body is formed with a reflector chamber closed at one side by a radiation transmitting member. At an opposite side, the housing is extended to form a socket enclosure. A lamp socket member is rotatably mounted in the socket enclosure and is structured to define spaced apart inwardly dished reflector surfaces, hereinafter referred to as concaved reflective surfaces, in each of which a lamp may be placed at a focal point and independently energized by electrical means. A reflector member is located in back of the radiation transmitting member and is formed with a socket aperture.At either side of the concaved reflector surfaces, the socket member is shaped to present tapered outer ends which can be moved into and out of the socket aperture. The arrangement of the parts is such that a de-energized lamp is constantly shielded by the tapered ends to prevent shadow or distortion when another lamp is in use. The socket member is rotated by means of a socket locking spindle which when removed, allows for lamp socket replacement, if desired.When the luminaire apparatus is utilized as a portable unit, the lamps are energized by a battery also carried by the user. Each lamp is independently operable by switch control means in the socket enclosure. When provided with an attaching hook, the housing in a relatively small size may be attached to a cap member to constitute a headpiece. Such a headpiece is particularly suited for use with a miner's cap lamp apparatus wherein the rotary socket means may support dual lamps to provide a miner with effective back-up light sources.