LUMINAIRE APPARATUS WITH MULTIPLE LIGHT SOURCE

摘要

TITLE LUMINAIRE APPARATUS WITH MULTIPLE LIGHT SOURCES INCLUDING METHOD AND MEANS FOR SWITCHING AND ADJUSTING FOCUS OF THE LIGHT SOURCE A holder, for example a multiple light source socket, is mechanically travelled in a supporting structure, in both rotary and linear paths of travel. Rotary travel provides for interchangeably locating lamps along a focal axis in a luminaire housing. Linear travel of the socket provides a focusing adjustment for each lamp along the focal axis to position it at a desired point of focus. In one form the supporting structure may comprise a miner's cap lamp having an externally located knob which may be manually turned by a miner to move the socket member. Other forms of supporting structures and movable parts may be provided as hereinafter disclosed.