Use this electronics calculation for a first-pass component, converter, signal, motor, or sensor estimate when the stated operating conditions and units match the device data.

Luminous flux (lm)

Total luminous flux emitted by the LED.

Power (W)

Electrical power consumed by the LED.

Compute the luminous efficacy of an LED from its luminous flux and electrical power. The tool evaluates the supplied inputs together and returns the named outputs below; it does not infer omitted operating conditions or change the units shown.^[1]

Efficacy (lm/W)

Luminous efficacy of the LED.

• LED forward voltage, current, power, efficacy, intensity, wavelength, and viewing angle depend on junction temperature, binning, drive waveform, optics, aging, and the manufacturer's measurement convention. Thermal design and absolute maximum ratings remain separate.
• Use finite inputs in the displayed units and preserve more precision than the final presentation requires. Independently verify safety-critical, financial, compliance, or production decisions.

Check the result against the current datasheet and worst-case operating corners, then verify the circuit or measurement with simulation and bench testing where failure matters.

• Inductor Steinmetz Core Loss Density

  Estimate magnetic-core loss density with a fitted Steinmetz power law p=k f^α B^β. Units of k must match the selected frequency, peak flux-density, and desired output units; the model applies only over its fitted waveform/range.

• LED Power Dissipation

  Compute the power dissipated by an LED from its forward voltage and current.

• LED Viewing Angle Intensity

  LED off-axis luminous intensity under an empirical cosine-power angular model calibrated by the half-intensity angle.