Tungsten lamps rates at 1.25 watts per horizontal candle-power, clear prismatic reflectors, either bowl or concentrating, large room; light ceiling; dark walls; lamps pendant; height from 8 to 15 feet .... .25

Same with very light walls........... .20

Tungsten lamps rated at 1.25 watts per horizontal candle-power; prismatic bowl reflectors enameled; large room; light ceiling; dark walls; lamps pendant; height from 8 to 15 feet ....... .29

Same with very light walls ........... .23

Gem lamps rated at 2.5 watts per horizontal candle-power; clear prismatic reflectors either concentrating or bowl; large room; light ceiling; dark walls; lamps pendant; height from 8 to 15 feet .... .55

Same with very light walls ........... .45

Carbon filament lamps rated at 3.1 watts per horizontal candle-power; clear prismatic reflectors either bowl or concentrating; light ceiling; dark walls; large room; lamps pendant; height from 8 to 15 feet ... .65

Same with very light walls ........... .55

Bare carbon filament lamps rated at 3.1 watts per horizontal candlepower; no reflectors; large room; very light ceiling and walls; height from 10 to 14 feet ............ .75 to 1.5

Same; small room; medium walls .......... 1.25 to 2.0

Carbon filament lamps rated at 3.1 watts per horizontal candle-power; opal dome or opal cone reflectors; light ceiling; dark walls; large room; lamps pendant; height from 8 to 15 feet ....... .70

Same with light walls ............ .60