Description
Return radiant power for a monochromatic photon rate.
Spectral and radiation quantities depend on their denominator coordinates, reference levels and physical definitions. A density per wavelength changes by a Jacobian when expressed per frequency, and photon counts, radiant energy, exposure and absorbed dose remain different quantities.
Return radiant power for a monochromatic photon rate.
When to use this tool
Use Photon Flux Radiant Flux One Wavelength when checking the stated spectral, photon, attenuation or radiometric conversion.
How to use the tool and how it works
- Enter photonsPerSecond, wavelength, planckConstant, lightSpeed. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read watts. Use the output convention below.
Return radiant power for a monochromatic photon rate. Require photonsPerSecond >= 0 and wavelength/Planck constant/light speed > 0; watts = rate*h*c/wavelength.1
SI distinguishes amount of substance, particle number and energy; named units retain their specific quantity definitions.2
| Input field | Meaning and units | Accepted input |
|---|---|---|
| photonsPerSecond | Photons Per Second | Required. Finite number; minimum 0. |
| wavelength | Wavelength | Required. Finite number; strictly above 0. |
| planckConstant | Planck Constant | Required. Finite number; strictly above 0. |
| lightSpeed | Light Speed | Required. Finite number; strictly above 0. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| watts | Watts | Required. Finite number. |
{
"input": {
"photonsPerSecond": 1000000000000000,
"wavelength": 5e-7,
"planckConstant": 6.62607015e-34,
"lightSpeed": 299792458
},
"output": {
"watts": 0.00039728917142978573
}
}Limitations and assumptions
- Use SI constants and wavelength in metres for watts; the tool does not integrate a broad spectrum or assess exposure safety.
- Inputs must satisfy both the field types and the cross-field conditions above. Invalid input causes an error; a successful false flag or documented placeholder is a different result.
- Numeric calculations use binary floating point unless exact decimal-integer arithmetic is explicitly stated. No hidden measurement tolerance or decimal rounding is added; nonfinite or out-of-contract results are rejected. Numeric signed-zero results are exported as zero.
Alternative or Complementary methods
Use a complete spectrum, measurement calibration and appropriate physical interaction model for integration, uncertainty or exposure interpretation.
References
Similar or alternative tools
- Radiant Intensity Isotropic Flux Factor
Convert uniform isotropic radiant intensity to total flux.
- Photon Number Density Energy Density Factor
Convert photon-number density at one supplied energy to energy density.