Trend of electric lighting

Significant are many of the trends shown in the annual report of the National Electric Light Association´s Lamp Committee. In three years the average wattage of lamps consumed has risen from 55.6 to 57.6; the percentage of exactly 115-volt lamps has risen from 42.8 to 44.6. The Committee recommends that every member company have a “well organized Lighting Service Department,” and that there be permanent lighting demonstration rooms in every city of the country.