For use in measuring, checking or testing instruments of Chapter 90, or for use in electrically operated apparatus for indicating intervals of time; High pressure (190-200 atmospheres), 100W to 300W mercury discharge lamps with arc gaps from 1.0mm to 1.3mm, mounted within a parabolic or elliptical dichroic glass reflector, and with a luminious efficiency of 60 (+/- 5) lumens per watt, for use in Canadian manufactures
Electric filament or discharge lamps, including sealed beam lamp units and ultra-violet or infra-red lamps; arc-lamps, light-emitting diode (LED) light sources. > Discharge lamps, other than ultra-violet lamps: > Mercury or sodium vapour lamps; metal halide lamps > For use in measuring, checking or testing instruments of Chapter 90, or for use in electrically operated apparatus for indicating intervals of time; High pressure (190-200 atmospheres), 100W to 300W mercury discharge lamps with arc gaps from 1.0mm to 1.3mm, mounted within a parabolic or elliptical dichroic glass reflector, and with a luminious efficiency of 60 (+/- 5) lumens per watt, for use in Canadian manufactures > For use in measuring, checking or testing instruments of Chapter 90, or for use in electrically operated apparatus for indicating intervals of time; High pressure (190-200 atmospheres), 100W to 300W mercury discharge lamps with arc gaps from 1.0mm to 1.3mm, mounted within a parabolic or elliptical dichroic glass reflector, and with a luminious efficiency of 60 (+/- 5) lumens per watt, for use in Canadian manufactures