Lúmen (lm) é uma medida da quantidade total de luz visível. Candela (cd) é uma medida que descreve a intensidade luminosa da luz emitida. A diferença entre lux e candela é que lux mede a iluminação de uma superfície, em vez de um ângulo. Lm/w is an excellent metric to help us choose LED fixtures accurately. Lumen é uma unidade derivada de candela (cd). But as consumer, what we want is the cost-effective lighting fixtures. Lumen has better description of lighting output than watt and it indicates the actual brightness of lighting fixtures. Ratio between total light output and energy consumption of light sourceĮxpress the efficiency (efficacy) of light source Total wattage (power or energy ) that is consumed for emitting light by light source Total light emitted by a light source falls on a surfaceĮqual to one lumen per square meter (lm/m²) Total light emitted in one direction or certain solid angle The total light emitted by a light source per unit of time In conclusion, a table of descriptions of lumen, candela, lux, watt, and lm/w are as followed: Lm/w means the ratio between total light output and energy consumption of light source. To connect the light output with wattage consumption, lumen and watt are used together in a term - lm/w, to express the efficiency (efficacy) of light source. But watt cannot indicate the light output directly. Wattage of LED flood light for outdoor sporting, however, can be up to 2000W. In general, wattage of LED high bay for industrial warehouse ranges from 100W to 200W. When we purchase LED fixtures, watt is the common term that indicates the ‘brightness’ of them. Watt is the measurement of the total wattage (power or energy ) that is consumed for emitting light by light source. The difference is that candela does not change with the distance but lux does.Ī table about the illuminance in different environments is as followed: Both candela and lux are used for measuring light intensity. For example, if one candela of light falling on an item, there is one lux at one meter (distance between light source and the illuminated item) while it will be 0.25 lux at 2 meters. If the item is moved further from light source, the lux levels will be reduced. Lux levels are related to the distance between light source and the item being lit. Lux is also used to measure the light intensity. One lux is equal to one lumen per square meter (lm/m²).
Lux refers to the total luminous flux on a surface. That is reason why LEDs are more effective than conventional light sources. In consequence, less light loss and more concentrated light are achieved. Compared to conventional light sources, LEDs emit and direct the light to where is needed through the composition of lens and package structure. In other words, candela describes the total light emitted in one direction or certain solid angle. Therefore, even lumen increase significantly, brilliance that human perceived may remain the same.Īs light intensity is not even in all directions, ‘Candela’ is used to measure the luminous intensity. However, total light output from all directions is only partly perceivable by human eyes and the light is emitted unevenly. It is often misunderstood that brilliance will increase with the increased lumen. In short, lumen is used to describe the total quantity of light emitted by the light source that you want to illuminate an area. Thus, the luminous flux measured by lumen is not emitted evenly. This metric describes the total output from all directions. After calculation the result size will be displayed.Lumen measures the total light emitted by a light source per unit of time. First select your desired calculation type and then enter the lumen or candela value and the beam angle of your lamp. The calculator helps you to easily convert between candela and lumens as well as lumens and candela. So the lamp with the smaller beam angle has the higher candela value. In case of two lamps with the same lumen value and different beam angles, the luminous flux is distributed over a different solid angle. On the other hand, candela refers to the amount of light emitted by a lighting device in a particular direction. The higher the lumens value of a lighting device, the greater the area it illuminates. The luminous intensity results from the luminous flux related to the solid angle. Lumens refers to the total amount of light a lighting apparatus emits.
But a comparison of these values seems to be difficult, because the luminous intensity additionally is direction-dependent. Candela Lumen Comparisonīoth values are transmission units. Especially for highly directional LED bulbs such as spots or LED recessed spotlights, the luminous intensity is sometimes indicated on the packaging or in the data sheet in addition to the luminous flux. This is the luminous flux emitted in a specific direction in lumens. The luminous intensity of a light source is specified in candela.
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