The luminous efficiency describes the efficiency of a lamp and is derived from the emitted luminous flux (lm) and the added electric power. Its unit is therefore lm/W.

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The illuminance expressed in Lux is a recipient variable, i.e. it describes the light output inciding on a given surface. The luminance, however, describes the perceived light that is emitted by a surface (whether this is used as light source or as a reflector). Luminance is the quotient of the luminous intensity (cd) and the surface perpendicular to the radiation direction (A).

* Definition of SI: SI is the International System of Units for physical quantities. ** A black body is a body that absorbs all radiation incident upon it.

Colour temperature helps determine quantitatively the colour impression of a light source. Colour temperature is the temperature of a black body** belonging to a particular colour of light emanating from the lamp. Upon heating a black body, the light colour changes from dark red to orange and yellow white to blue white.

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Photometric quantities are fundamental concepts in lighting technology that measure the power and distribution of light when analyzing light sources.

The Colour Rendering Index (CRI) is specified in Ra and expresses the colour rendering quality of luminous sources. Unlike neutral and cold white light, warm white light has a high amount of red. This leads to different colour sensations. The Ra value indicates how much of the natural colour spectrum of sunlight is reflected by a lamp. A light bulb reaches a value of 100 Ra, while a white LED lamp attains Ra values between 70 and 98. The higher the colour rendering index, the better the colours of an illuminated object are perceived.

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If you have any questions about photometric quantities, we are here for you! Fill out our form and we will get back to you as soon as we have processed your enquiry.

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The luminous flux is the total light output emitted from a light source in all directions. The lumen already considers the sensitivity of the eye. That is to say, two light sources with the same luminous flux are perceived as equally clear regardless of their light color.

Illuminance indicates how much luminous flux incides on a defined area and is therefore calculated as the quotient of the luminous flux (lm) by the illuminated area (m²). The illuminance developed by a light source over a given area decreases as a square of the increasing distance.

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The luminous flux, measured in lumens, indicates the total output of a light source, while the luminous intensity, measured in candelas, describes the part of the luminous flux that is emitted into a specific solid angle. The lighting intensity, measured in lux, provides information on how much luminous flux falls on a certain area. These parameters are crucial for the planning and evaluation of lighting systems in various areas of application.

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Photometric quantities such as luminous flux (measured in lumens), luminous intensity (measured in candelas) and lighting intensity (measured in lux) play a decisive role in the evaluation of lighting systems in terms of their light quality and quantity.

LightPath Technologies is a recognized leader in optics and photonics solutions, serving blue chip customers in the industrial, defense, telecommunications, testing and measurement, and medical industries, for over 30 years. LightPath designs, manufactures, and distributes optical and infrared components including molded glass aspheric lenses and assemblies, infrared lenses and thermal imaging assemblies, and fused fiber collimators.

Photometric quantities are measured quantities that quantify the brightness and lighting intensity of light sources based on human perception. Units such as lumen and lux are used to describe light intensity and lighting level.

„Lumen ist das neue Watt “ bedeutet, dass man Leuchtmittel nicht mehr aufgrund der Watt -Angabe sondern anhand der Lumen-Angabe bewertet. Wie in der Tabelle ersichtlich  erreichen LED Leuchtmittel mit viel weniger Watt deutlich höheren Wert beim Lichtstrom  (ausgestrahlte Lichtleistung).

Lamps radiate in several directions - but with different strength. Light intensity indicates the luminous flux that is emitted at a solid angle (thus in a certain direction). Luminous intensity is a characteristic of the light source and has no relation to human perception. An ordinary household candle has a luminous intensity of 1 cd and therefore corresponds to one lumen per solid angle.