Timelapse thermographic comparison of an incandescent lightbulb left and an energy_saving compact fluorescent lightbulb right. Thermography shows the temperature of an object, on a scale from dark blue coldest through green, yellow and red to white hottest. These bulbs have been turned on and left for ten minutes. The incadescent bulb gets a lot hotter than the energy_saving bulb. Energy lost as heat is wasted, and this clip reveals that the energy_saving bulb does not waste as much energy. For an X_ray view of both types of lightbulb see clip number K003/2426.