LED Thermal & Efficiency Calculator

Calculate LED efficiency metrics and junction temperature from electrical and thermal parameters.

Electrical Parameters
Thermal Resistance (°C/W)
Environment
Power Budget
P_electrical
2.170W
P_optical
1085.0mW
P_dissipated (heat)
1.085W
Efficiency
Wall-plug efficiency (WPE)
50.00%
External quantum efficiency (EQE)
56.25%
Thermal
Total R_θ (j-a)
14.30°C/W
Junction temperature (T_j)
40.52°C
Thermal margin
Safe
109.5°C
Abridged Optics — LED Thermal & Efficiency Calculator v1.0EQE = WPE × eV_F / hν. Assumes linear thermal model.

All information, equations, and calculations have been compiled and verified to the best of our ability. For mission-critical applications, we recommend independent verification of all values. If you find an error, please let us know.