Lamp rerating

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Lamp rerating is modelling the predicted properties of a filament lamp when running the lamp at a voltage other than its specified rating, using a power law function of voltage. The following equations can be used to estimate the new operating point. The exact value of the exponent parameters will typically vary slightly with the particular lamp design.[citation needed]

Va = Applied voltage
Vd = Design voltage
  • Rerated current = (Va/Vd)0.55 × current at design voltage [1]
  • Rerated life = (Va/Vd)-12 to -16 × Life at design voltage [1][2]


  1. ^ a b c Welch Allyn (2007). "Miniature halogen lamps; lamp electrical characteristics". Retrieved 2011-09-06. 
  2. ^ a b c d Fink, Donald G.; H. Wayne Beaty (1978). Standard Handbook for Electrical Engineers, Eleventh Edition. New York: McGraw-Hill. pp. 22–8. ISBN 0-07-020974-X.