Democratic Sentinel, Volume 7, Number 30, Rensselaer, Jasper County, 24 August 1883 — Power of Electric Lights. [ARTICLE]

Power of Electric Lights.

The heat from an arc electric lamp of 100-candle power is from 57 to 158 heat-units, that of the incandescent lamp of equal brilliancy from 290 to 536. The argand gas-burner is the next best light in point of coolness, but this is represented by 4,860 heatunits, a colza oil lamp by 6,800, a flat wick petroleum lamp by 7,200, a paraffine candle by 9,200, and a tallow candle by 9,700. Light for light, therefore, the heat of an electric arc lamp under the most favorable circumstances is to the heat of tallow as 1 to 170.