![]() The candela measures the amount of light emitted in the range of an angular (three-dimensional) span. Since light intensity is described in terms of an angle, the distance at which you measure this intensity is irrelevant. The candela (cd unit) has its origin in the brightness of a “standard candle”, but has received a more precise definition in the International System of Units (SI), and at that time the unit was also called a “candle” or “candle”. More importantly, this knowledge will ensure that your lighting supplier does not mislead you, as they may try to convince you of the advantages of a lighting fixture by citing impressive lumens or candela numbers that are not relevant to your needs. ![]() Knowing the difference between lumens and candela will help you choose lighting fixtures that suit the needs of your workplace Lumens and candela are units of measurement for lighting, but they measure different aspects of a lighting fixture. Step 3: Example: An LED luminaire produces 1.5 candela at a corner angle of 70 °, how many lumens does it produce? All you have to do is replace 1.5 cd and 70 ° C in the conversion formula, which will give you: 1.7lm. Step 2: Enter the candela and degrees into the formula: lumens = candela × (2π (1 – cos (degrees / 2))) . Step 1: Obtain the candela and the vertex angle in degrees of the light source. (These values are in catalogs and the internet). In other words, the formula to convert from candela to lumen is as follows: Steps to convert from candela to lumen When making the replacement of the formula of the steradians (2) in the formula of candela to lumen (1), we have the following: To convert from candela to lumens, the value of candela must be multiplied by the angular interval of the light source in steradians, as shown in the following formula (1): Where, is the symbol of the lumens to find and, is the symbol of the candelas, while, it is the symbol of the steradians that are defined by the following formula (2): After calculation the result size will be displayed.Examples of how to convert from candela to lumen 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. The luminous intensity results from the luminous flux related to the solid angle. 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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