What’s The Difference Between Lumens, Candela and Lux?
Lumen, Candela, and Lux are all 3 units for measuring light. However, they can not be compared directly. In this article, we are going to go over the difference between them.
Lux is a measure of the intensity of light that falls to a specific location. For example, on a wall or on the floor of an office. 1 Lux is about the brightness of a candle at 1 meter away.
You can add Lux, so if 1 candle produces 1 Lux at 1 meter distance, then 2 candles will give a 2 Lux light at a meter away.
If the distance of a light source is doubled, the number of lux that falls on a surface is decreased by 4. So a medium candle produces approx. 0.25 lux at 2 meters distance. This is because the surface to be illuminated is 4 x larger.
The Lux is not a unit that can be used to measure the luminous intensity of a light source such as a flashlight. However, it is a unit that is the basis of the Candela and Lumen units used in the specifications of flashlights www.tacticalgearguides.com/best-tactical-flashlight.
Candela, also called Candle Power, is the quantity of Lux that a light source produces at a distance of 1 meter, at the brightest point of the beam. This is a measure that was previously widely used to specify the luminous intensity of flashlights. The Candela informs you about the intensity of light, but not about the total amount of light. After all, with a reflector or a lens, you can get more intensity of light (and therefore more Lux), without necessarily using a more powerful lamp.
The Lumen is a measure of the total amount of light from a lamp. With the Lumen as a unit of measurement, the beam does not matter. Two flashlights that offer the same number of lumens do not have to be as bright or have the same range.
The Lumen is a measure that is now widely used in the specifications of flashlights. However, the number of lumens says nothing about the range of a light. You must then at least take into account the shape of the beam.
Fortunately, nowadays many manufacturers also give, besides the number of lumens, the distance that a flashlight can reach and, in addition, we carried out measurements ourselves.
I hope that this article was able to clear up some of the misconceptions about the lumens and other specs that are commonly used in flashlights and other lamps.