This Early applications of lighting was using lamps which used a heated filament to provide light. The filament was made of tungsten and was placed inside a near vacuum glass enclosure. While it was cheap, it produced a lot of heat, so that it was inefficient too. Note that the incandescent bulb is a purely resistive load power factor 1. -800 Early applications of lighting was using lamps which used a heated filament to provide light. The filament was made of tungsten and was placed inside a near vacuum glass enclosure. While it was cheap, it produced a lot of heat, so that it was inefficient too. Note that the incandescent bulb is a purely resistive load power factor 1. "magnet battery motor " and "cost to solar power your home " (include "home energy audit kansas city", "magnetic motor schematic ", "how to generate electicity ", "magnetic motor how to build ", "how the solar power works ", "Home energy audit maine ", Solar power, but what is solar power? and how will you make the best use of it? well, the answer to this is very. & Energy star home tax credit )