Lamp rerating

Updated on Nov 01, 2023

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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.

V_a = Applied voltage V_d = Design voltage

Rerated current = (V_a/V_d)^0.55 × current at design voltage

Rerated luminous intensity = (V_a/V_d)^{3.4 to 3.5} × Luminous intensity at design voltage

Rerated life = (V_a/V_d)^{−12 to -16} × Life at design voltage

Rerated electrical power = (V_a/V_d)^1.6 × Electrical power at design voltage

Rerated color temperature = (V_a/V_d)^0.42 × Color temperature at design voltage

References

Lamp rerating Wikipedia

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