In photometry, luminous intensity is a measure of the wavelength-weighted power emitted by a light source in a particular direction per unit solid angle...

One lumen is defined as the luminous flux of light produced by a light source that emits one candela of luminous intensity over a solid angle of one steradian...

/kænˈdiːlə/; symbol: cd) is the unit of luminous intensity in the International System of Units (SI). It measures luminous power per unit solid angle emitted...

In optics, Lambert's cosine law says that the radiant intensity or luminous intensity observed from an ideal diffusely reflecting surface or ideal diffuse...

radiance (radiometric) Luminous flux (photometric) and radiant flux (radiometric) Luminous intensity (photometric) and radiant intensity (radiometric) In photometric...

sometimes called current intensity in older books Radiant intensity, power per unit solid angle (W/sr) Luminous intensity, luminous flux per unit solid angle...

directions has a total luminous flux of 1 cd × 4π sr = 4π cd⋅sr ≈ 12.57 lm. If a light source emits one candela of luminous intensity uniformly across a solid...

the luminous or radiant power per unit solid angle. This can cause confusion in optics, where intensity can mean any of radiant intensity, luminous intensity...

are commonly known as intensity: Radiant intensity, a radiometric quantity measured in watts per steradian (W/sr) Luminous intensity, a photometric quantity...

perception. Similarly, luminous emittance is the luminous flux per unit area emitted from a surface. Luminous emittance is also known as luminous exitance. In SI...