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.

On Axis Candela (cd)

Required number input.

Half Intensity Degrees (°)

Required number input.

Off Axis Degrees (°)

Required number input.

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

Off Axis Candela (cd)

The resulting off axis candela returned as a number.

• 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.

• LED Luminous Intensity

  Average luminous intensity in candela from lumens emitted into a known solid angle; assumes uniform angular distribution.

• Antenna Half Power Beamwidth

  Angular separation of the two −3 dB pattern crossings around one antenna main lobe.

• LED Efficacy

  Compute the luminous efficacy of an LED from its luminous flux and electrical power.