GUSTOIMAGES / SCIENCE PHOTO LIBRARY GUSTOIMAGES / SCIENCE PHOTO LIBRARY
Radiographic comparison of an incandescent lightbulb (left) and an energy-saving compact fluorescent lightbulb (right). The incandescent light bulb uses much more energy, as it wastes a lot of energy as heat, rather than light. For a thermographic timelapse view of both types of lightbulb showing this, see clip number K003/2425.
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