Lighting Country Homes by Private Electric Plants (Classic Reprint)

Excerpt from Lighting Country Homes by Private Electric Plants

Besides being cheaper to operate than the carbon lamp, these tungsten lamps will burn a greater number of hours. The carbon lamp will, under good conditions, burn about 500 hours, and at the end of that time, the candle power will have fallen 20 per cent; i. E if when new it gives 16 candle power, at the end of 500 hours of service it will give but candle power. The tungsten lamp, however, will often burn for 1000 hours, and duri...