Light intensity

Several measures of light are commonly known as intensity:


 * Radiant intensity, a radiometric quantity measured in watts per steradian (W/sr)
 * Luminous intensity, a photometric quantity measured in lumens per steradian (lm/sr), or candela (cd)
 * Irradiance, a radiometric quantity, measured in watts per square meter (W/m2)
 * Intensity (physics), the name for irradiance used in other branches of physics (W/m2)
 * Radiance, commonly called "intensity" in astronomy and astrophysics (W·sr−1·m−2)