![]() Thus, to convert from candlepower to lumen, you can multiply the candlepower measurement with 12.57, and to convert from lumen to candlepower, you can simply divide the lumen measurement by 12.57.įor example, a 40-watt lamp rated at 500 lumen has a candlepower of (500 ÷ 12.57) = 39.8 cd. ![]() While the formula to convert candlepower to lumen is given as, Hence, the formula to covert lumen to candlepower can be obtained as following, Therefore, a light source which uniformly radiates an intensity of one candela in all directions is given by following, The solid angle in a full sphere is equal to 4 Π steradians. Thus, a lumen can be expressed mathematically as, From its definition, a source of light emitting one candela of luminous intensity uniformly over a solid angle of one steradian is said to be emitting one lumen. However, by applying mathematics, a close-enough approximation can be obtained.įor all practical purposes, candlepower equates directly to candela. How to Convert Lumen to Candlepower and Vice Versaįrom the above discussion, it is clear that lumen and candlepower measure two different things, and therefore, accurately converting one to another is not possible. But before we find out what it is, let’s get a clear understanding of what each of the terms ‘lumen’ and ‘candlepower’ imply. A small conversion factor is involved in the process of changing one to another. However, these two quantities don’t mean the same thing, and therefore, cannot be used interchangeably. Manufacturers express luminosity in terms of candlepower, lumen, or both. It is a direct indicator of the amount of light that the source can produce. But, from among the profusion of different flashlights out in the market, how do you pick out the best one? The answer to this question can be found in the luminous output of each individual flashlight.Įach light-source is designed to output light having a certain degree of luminosity. Very few artificial light-sources, such as a military flash-bomb, have the high candlepower rating of a narrow beam spotlight, while simultaneously having a very high lumen rating as well.īe it for a nighttime trek through the jungles of Amazon, or just for a casual exploration of the haunted house in your neighborhood, the importance of having a capable flashlight for after-dark adventures simply cannot be undermined.
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