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average initial lumens bulb Bureau of Standards candlepower cent of average Changes in Efficiency Circular Commercial Ratings comparison data efficiency rating factory Filament Lamps group of lamps group of packages incandescent lamps individual lamps initial rated lumens Initial Rating Test initial test inspection-test lamps lamps furnished lamps representing lamps tested least five lamps life-test lamps lot of lamps lumens per watt mean lumens measure of lumen mechanical and physical modified by article mutually agreed number of hours number of lamps number of test Number ol ol lamps package group paragraph performance test physical inspection test provided such group quantity of lamps rated initial lumens rated volts rating-test lamps rejected without further REJECTION FOR DEFECTIVE REJECTION FOR FAILURE required for rejection Schedules of Commercial SELECTION OF LAMPS small number specified efficiencies spherical reduction factors Tables of Tolerances test results test samples tolerances and comparison tungsten voltage offered watt Hours watt specified