31. Halogen lamps are a type of incandescent lamp with improved efficiency over regular incandescent lamps. 32. Groundlings say that they would rather buy halogen and incandescent lamps than curse the dark. 33. However, recent products have solved these problems so that they perform more like incandescent lamps . 34. Incandescent lamps were primarily used for street lighting until the advent of high-intensity discharge lamps.35. This experiment with carbon led to his design for an incandescent lamp , and on it went. 36. As of 2016, LEDs use only about 10 % of the energy an incandescent lamp requires. 37. Chaillet started in the incandescent lamp business with his father, who operated a factory near Paris. 38. The date of the employment of arc and incandescent lamps may be set at about 1877. 39. The efficiency of electric lights has continuously improved from the first incandescent lamps to tungsten filament lights. 40. In 1893, the Edison Electric Light Company sued three manufacturers of incandescent lamps for infringing Edison�s patent.
