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Student Sharing. Parents Message by Brother President. Catholic Parents Group. St Miguel Group. Links for Parents. Alumni Distinguished Alumni. The luminous flux depends on the power of the source and on the color of the light. The smaller the angle of radiation in which the light is emitted, the higher the luminous intensity with constant luminous flux. 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 lux thus corresponds to the illuminance that is obtained when each square meter of the considered surface receives a luminous flux of one lumen.

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Lux can be measured from different distances. Be careful when making a comparison between two lamps. 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. With a light meter you can measure the lux value of any surface or space.

When measuring, make sure that the light meter is placed at working height. As the distance from the light source to the object to be illuminated increases, the illuminance decreases in the square.

Lumen (unit)

Brightness is indicated by the candela symbol cd. The light intensity indicates how much light is in each piece of a light beam. The word candela means candle in Latin. One candela corresponds approximately to the light intensity of a normal candle. The candela is related to the lumen and lux units.

The unit lumen is used for the total luminous flux in a light beam. A light beam with a strength of 1 candela and a space angle of 1 steradian for a cone-shaped beam corresponds to an opening angle of