Scientific and photographic apparatus, namely, micro projection lamps for use with a microscope; projection lamps to produce a specific wave length for photometric purposes; photographic lamps for film exposure; gas discharge lamps that produce individual spectra for medical diagnosis; mercury and metal halide lamps for photo-engraving; flat coiled filament lamps used to pinpoint areas in scientific experiments; lamps used for color separation in photo-engraving; xenon arc lamps used in microscopes