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If you want to focus on the overall brightness of a light, your material concern is Lumens.
![lumens to candela lumens to candela](https://www.opt-7.com/product_images/uploaded_images/what-is-candela-lumen-lux.jpg)
One Lumen is equal to one Candela of light at a distance of one meter from the light source, and we’ll see how that is measured further down. Lumens is a measure of the total output from a light source in all directions. Wait…did I type that out loud? What Does Lumens Measure? What are Lumens? Lumens (lm), by definition, is a marketing term that is often misused to indicate flashlight quality.
![lumens to candela lumens to candela](http://www.jwspeaker.com/content/uploads/1091-300x244.jpg)
Let’s break each of these down to better understand them. Like lumen, the Latin word lux also means light. Another adaptation of a Latin word, lux emerged in English around the same time. It was an adaptation of the Latin word lumen, which translates to English as light. Use of the English word Lumen as a measure of light began in the late 1800s – more than 20 years after the coinage of the word candlepower. In 1948, the definition was changed to reference platinum and radiometry instead of whale wax and grains, and the term candlepower was replaced with Candela. Between 18, a unit of candlepower was measured from a candle that was made from pure spermaceti (wax from sperm whales), weighed one-sixth of one pound, and burned at 120 grains per hour. The term candlepower – now mostly obsolete – was coined in 1869 according to Merriam-webster, and refers to a unit of luminous intensity. The history of Candela goes back 150 years. Lux measures the amount of light that falls on a surface.Ĭandela is light’s intensity as visible to the human eye in a specific direction. Lumens is a measurement of how much light is emitted from a light source in all directions. What’s the difference between Lumens, Lux, and Candela? How do Lumens, Candela, and Lux relate to each other?.What’s the difference between Lumens, Lux, and Candela?.