Template:SI photon units
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| Quantity | Unit | Dimension | Notes | |||||
|---|---|---|---|---|---|---|---|---|
| Name | Symbol[nb 1] | Name | Symbol | Symbol | ||||
| Photon energy | n | 1 | count of photons n with energy Qp = h⋅c / λ.[nb 2] | |||||
| Photon flux | Φq | count per second | s−1 | T−1 | photons per unit time, dn/dt with n = photon number. also called photon power. | |||
| Photon intensity | I | count per steradian per second | sr−1⋅s−1 | T−1 | dn/dω | |||
| Photon radiance | Lq | count per square metre per steradian per second | m−2⋅sr−1⋅s−1 | L−2⋅T−1 | d2n/(dA cos(θ) dω) | |||
| Photon irradiance | Eq | count per square metre per second | m−2⋅s−1 | L−2⋅T−1 | dn/dA | |||
| Photon exitance | M | count per square metre per second | m−2⋅s−1 | L−2⋅T−1 | dn/dA | |||
| See also: Photon counting · SI · Radiometry · Photometry | ||||||||
- ↑ Standards organizations recommend that photon quantities be denoted with a suffix "q" (for "quantum") to avoid confusion with radiometric and photometric quantities.
- ↑ The energy of a single photon at wavelength λ is Qp = h⋅c / λ with h = Planck's constant and c = velocity of light.
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