![]() Its unit is lux (lx), defined as equal to one lumen per metre squared (1 lm/m²). Illumincance is a measure of the amount of light falling on a particular surface. The output from a lamp is usually quoted in lumens, summed over all directions, together with the distribution diagram in candela. The intensity is the same but the total energy flux from the lamp, in lumens, is not the same. ![]() ![]() If the radius of the sphere is 1 metre, which implies its area to be 4πr², then the luminous flux of the point light source of 1 candela is 4π lumens, as shown in Figures 2 & 3.įor instance, a light source can be emitting light with an intensity of one candela in all directions, or one candela in just a narrow beam (as in most LEDs). Steradian is the spatial angle that limits the surface area of the sphere equal to the square of the radius. One lumen is the luminous flux of the uniform point light source that has luminous intensity of 1 candela (cd) and is contained in one unit of spatial angle (or 1 steradian). Luminous flux (or luminous power) is the quantity of light energy emitted in all directions. Luminance is a measure of the brightness of a particular surface if considered as a large light source. Luminous intensity is a measure of the amount of light originated from the source, its light output, the unit of which is the candela (cd). This article presents a short overview of the terms used to describe lighting technologies.
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