As the distance from the light source to the object to be illuminated increases, the illuminance decreases in the square. Click hereto get an answer to your question Candela is the unit of. Nonetheless, luminous intensity is comparable to radiant intensity. Candela is represented in terms of cd/m2. It is the luminous power per unit solid angle emitted by a point light source in a specified direction. When measuring, make sure that the light meter is placed at working height. Candela is the SI unit of luminous intensity. With a light meter you can measure the lux value of any surface or space. A lamp that gives the same number of lux at three meters distance than a lamp measured at one meter is much more powerful than the one measured on a meter. Be careful when making a comparison between two lamps. Lux can be measured from different distances. The number of lux is thus found as the quotient of the total received luminous flux, expressed in lumens, and the size of the illuminated area expressed in square meters therefore 1 lux = 1 lumen / m². The lux thus corresponds to the illuminance that is obtained when each square meter of the considered surface receives a luminous flux of one lumen. The lux (symbol lx), latin for light, is a unit of illumination: 1 lux is the illuminance produced by 1 candela on a surface perpendicular to the light rays at a distance of 1 meter from the source. The smaller the angle of radiation in which the light is emitted, the higher the luminous intensity (with constant luminous flux). An incandescent lamp gives a luminous flux of approximately 12 lm / W. The luminous flux depends on the power of the source and on the color of the light. It is the unit of luminous intensity as prescribed by the International System of Units. If one sees a part of a light beam, that part has a smaller luminous flux (in lumen) but (in principle) the same luminous intensity (in candela) as the whole beam. A candela (cd) is the measure of light intensity in a given direction. Light intensity is a measure of the light density. Luminous flux is a measure of the total amount of light in a light beam. Lumen is therefore the unit to measure the brightness of a light source independently of the direction of the light beam. Luminous flux takes into account the sensitivity of the eye to the visible part of the electromagnetic radiation. It measures the total amount of light emitted by a light source in all directions. The lumen (symbol: lm) is the unit for luminous flux.
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