The 1992 Energy Policy Act (EPACT) brought significant changes to the US electric lighting industry. One such change required replacing many ordinary incandescent lamps with more energy-efficient tungsten halogen lamps. Tungsten halogen, though, is by no means a new development. As we near the golden anniversary of the halogen lamp's invention, the author looks back and explores the roots of the most important extension of incandescent lighting technology since 1913.
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