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. -929 The 5 inch pulley should do it. You are absolutely correct in assuming that one of about the same size as is used in the car about a 6 would be correct to give the right alternator speed. But remember that most cars spend much of their lives well BELOW 2500 rpm, so the pulley is sized to give a compromise belt speed for water pump, fan, alternator, etc. In fact many cars have a stepped pulley with a different size for running the Power Steering pump, and yet another for the A/C. "electricity safety home " and "home energy monitor uk " (include "freedom tower windmills", "aeon labs home energy monitor ", "how to make model solar system ", "green home energy inc ", "howard johnson magnetic motor plans ", "Duke energy bill pay online ", reduce energy cost, low carbon, ground source heat pumps,Co2, air source heat pumps, biomass energy, solar energy, bio energy, wall heating, & Home energy auditor salary )