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The density of luminance provides information about the impression of brightness of a luminaire. It is expressed in luminous intensity per area (cd/m²). The density of luminance describes how bright a surface appears to us. This factor is also influenced by other circumstances, such as the condition of the illuminated surface.

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Another formula for calculating illuminance at greater distances is as follows: Lux [lx] = luminous intensity [cd] / radius or distance squared

The further away the area is from the light source, the lower the illuminance. The lux value determined can be used to determine whether certain areas are sufficiently well lit. For example, there are labor-law requirements for how brightly a work area should be illuminated for employees.

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Luminous intensity is an important value for comparing different lamps. Lamps with the same luminous flux can have completely different luminous intensities due to their beam angle. The beam angle indicates the angle at which the light is emitted by the lamp.

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A standard candle, for example, emits a luminous intensity of 1 cd, i.e., it emits about 12 lumens (lm) in all directions.

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What is the metric unit used for measuring luminous intensity? Candela (cd) is the metric unit of luminous intensity. As an example, the luminous intensity of a candle is approximately one candela.

The luminous intensity is a photometric value that describes the radiation of light emitted in a certain direction. Since the radiation behavior of an optical signaling device is not only determined by the light source but also by the design of the domes, the luminous intensity is best suited to characterize the signaling effect of optical signaling devices.

To assess the brightness of a luminaire or illuminant, it is essential to consider all three values. The units lumen and candela are quoted by most manufacturers. Manufacturers cannot quote the lux value because this value depends on the ambient conditions of the area of application.

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The solid angle is the three-dimensional size of the light cone. If a luminaire emits light, the angle of the emitted light is three-dimensional. The unit of the solid angle is the steradian (sr). The light intensity indicates the amount of light that a light source emits per solid angle.

The reflection factor indicates the percentage of the luminous flux that hits a surface that is reflected. Depending on the nature of the illuminated surface, the light is reflected, absorbed or transmitted.

Lux provides information about the illuminance. It is a measure of the brightness with which an area is illuminated. Lux indicates how much luminous flux (lumen) of a light source arrives per unit area of a receiver surface. The value lux is purely a receiver quantity.

- Incandescent lamp with 15 W electrical power: luminous flux Φ = 90 lm - Compact fluorescent lamp/energy-saving lamp: with 15 W electrical power: luminous flux Φ = 900 lm

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The colour temperature of a lamp determines whether the light gives a warm or cool impression. The colour temperature is given in Kelvin and can be assessed on a scale. The lower the colour temperature, the warmer and darker the light appears. The higher the colour temperature, the cooler and brighter the light appears.

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Light intensity is one of the photometric quantities. It relates the light flux to the beam angle of a light source. The luminous intensity therefore indicates how concentrated the light is or what density the emitted light has.

If the calculation according to the above formulae is not possible for the lamp, a light measurement can be carried out with an integrating sphere and a spectrometer. This creates a luminous intensity distribution curve. From this, conclusions can be drawn about the luminous intensity.

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A luxmeter is a light inensity meter and measures the illuminance (lux). The value indicates how bright it is at the measuring point. The luxmeter consists of a photo sensor and a display. The photo sensor usually consists of photo diodes that detect the light. The measured lux value then appears on the display.

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Light consists of photons, also called light particles. They travel in waves and transmit energy impulses. Light is created when energy is converted. When visible light is emitted, this is also called luminescence. How bright and colourful the human eye can perceive a light depends on the wavelength of the radiation and the intensity with which the radiation hits the retina.

The colour temperature influences the room atmosphere. For living rooms, a lower colour temperature is preferred, for laboratories or factories, light with a higher colour temperature. The scale below shows the colour temperature and its three ranges: Warm white, neutral white and daylight white.

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When an object is illuminated, it emits colours. The colour emitted is not only determined by the colour of the object itself, but also by the light source. The illuminant emits different wavelengths that are absorbed or reflected by the illuminated object. Those wavelengths that match the illuminated object are reflected, the rest is absorbed. The colour rendering index therefore depends on which wavelengths are emitted by the light source.

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The colour rendering index, abbreviated CRI (Colour Rendering Index) or RA (General Reference Index) tells us what quality the emitted light has.

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The focal length, which is frequently specified in millimeters (mm), is the essential description of a camera lens. It is calculated from the optical ...

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To determine the luminous intensity of a lamp, you need the luminous flux and the beam angle or solid angle. The value of the luminous- or light intensity is given in candela. The units of luminous flux are lumens, for the solid angle it is steradians.

If light is reflected, it is reflected back. Mirrors have a reflectance of 1. Light surfaces have a value close to 1, dark surfaces have a value below 0.1. In a room with dark walls, more light is needed than in a room with light walls to create sufficient illuminance on the working plane.

The unit lumen stands for the total light output of a luminaire emitted in all directions. However, since the light emitted by luminaires is not emitted evenly in all directions, the luminous intensity is given in candela. So candela is the unit of light intensity. This value indicates how much light is emitted in a particular direction. In contrast to these two emitted quantities, there is also the receiver quantity lux. The lux unit does not measure how much light is emitted, but how much of the emitted light reaches a certain surface.

Colour temperature can be measured with a colourimeter. Besides colour temperature, the colour rendering index is also significant for the spatial atmosphere.

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In light measurement, a distinction is made between various photometric quantities by which the unit of light intensity can be evaluated. The following table provides an overview of the most important photometric quantities and units:

The terms lumen, candela and lux occur very frequently in light measurement. They are all photometric quantities. The following diagram shows the relationship between the three terms.

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The luminous efficacy is a measure that indicates how efficient a light source is. It is the ratio of lumens to power or watts, so it is measured in lumen per watt (lm/W) in the International System of Units (SI). The higher the value, the more efficient a light source is.

The value Lumen does not take the brightness sensation into account. The perception of brightness is additionally influenced by the beam angle and the design of a luminaire. Also, the color temperature of the illuminant and the condition of the environment play a role in the perception of brightness.

The luminous intensity or its candela value indicates how intensively the light is emitted. The more focused the light is emitted, the more intense it is. The diagram shows two lamps with the same luminous flux (lumen) but different beam angles. The luminous intensity of the lamp with the smaller beam angle is higher than that of the lamp with the wider beam angle.

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Natural sunlight has an RA value of 100, which is also the highest RA value. The closer the RA value is to 100, the higher the quality of the lighting.

The light flux is measured in lumens (abbreviation lm). The unit lumen is an internationally standardized unit of measurement for the light flux of a light source. It indicates how much light is emitted by a radiation source in all directions, so it measures the total light output. The lumens of a luminaire therefore provide information about its brightness. Identical luminaire types can be compared by their wattage.

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Different lamps, however, produce different amounts of light and therefore cannot be compared by wattage. To compare the high intensity of different lamps, luminous flux must be used.