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Basic terms of lighting: What you should know before buying a lamp

Updated: Dec 15, 2023



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Lighting is more than just turning the light on or off.


Lighting is an art and a science that can influence the ambiance, function and safety of a room.


Before you buy a lamp, you should know some basic terms of lighting that will help you make the right choice.


In this blog post, we will introduce you to the most important terms and explain what they mean.


  • Luminous flux: The luminous flux is the total light output of a lamp in all directions. It is measured in lumens (lm) and indicates how bright a lamp is. The higher the luminous flux, the more light the lamp produces.

  • Luminous efficacy: The luminous efficacy is the ratio between the luminous flux and the electrical power of a lamp. It is given in lumens per watt (lm/W) and indicates how efficient a lamp is. The higher the luminous efficacy, the less energy the lamp consumes.

  • Luminous intensity: The luminous intensity is the amount of light emitted by a lamp in a specific direction. It is measured in candela (cd) and indicates how intense a lamp shines. The higher the luminous intensity, the stronger the light beam.

  • Illuminance: The illuminance is the luminous flux that hits a specific area. It is measured in lux (lx) and indicates how bright an area is illuminated. The higher the illuminance, the better the visibility.

  • Luminance: The luminance is a measure of the brightness impression in the human eye. It is measured in candela per square meter (cd/m²) and indicates how bright a luminous or illuminated area appears. The higher the luminance, the brighter the light.

  • Color temperature: The color temperature is a measure of the color of the light. It is measured in Kelvin (K) and indicates whether the light appears warm or cold. Warm light has a low color temperature (below 3300 K) and appears yellowish or reddish. Cold light has a high color temperature (above 5300 K) and appears bluish or whitish.

  • Color rendering index: The color rendering index is a measure of the quality of the light. It is given in Ra and indicates how natural the colors appear under a specific light source. The color rendering index can range from 0 to 100, with 100 being the best color rendering. The higher the color rendering index, the better the color fidelity.


As you can see, there are many factors that you should consider when choosing a lamp. To make it easier for you, we have at Kent Leuchten https://www.kentleuchten.de a large selection of high-quality and stylish lamps for every taste and need. Our lamps are handmade, durable and energy-efficient. They meet the highest standards of lighting technology and offer you an optimal lighting experience. Take a look at our range and let our experts advise you. We look forward to your visit! 😊