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Candela, lumen, lux

 

The most important Basic Terms of Light Technology.


The technical data on the flashlight market are often confusing and difficult to compare. For this reason, we would like to briefly explain the most important terms for you.
 
lumen
The luminous flux means the quantity of light emitted.

Luminous flux in Lumen (lm)


Luminous flux is the most important term for characterising the performance of a lamp. It refers to the amount of light or light energy that is actually radiated from a light source. But what is measured? Some manufacturers indicate the luminous flux of the LED or incandescent light bulb and neglect to say that it is significantly reduced by the losses in the reflector/lamp head (sometimes by over 30%). Our luminous flux values are values measured with spectro - meters, which the lamps radiate from the reflectors with new alkaline batteries.

 
lux
The Illuminance means the illumination of a surface.

Illuminance in Lux


This value refers to the intensity with which a surface is lit. It comes from photography and light architecture. There are clear specifications as to which illuminance workplaces or supermarkets must have. Illuminance is measured with lux meters. With our Advanced Focus System and Dynamic Switch, you can adjust the illuminance to your needs. An illuminance that is too high glares on a map; too low or inhomogeneous lighting on a rocky path reduces sure footedness.
 
candela
Luminous intensity is the luminous flux per unit solid angle (steradian).

Luminous flux in Candela (cd)


Simply put, luminous intensity refers to the strength of the beam. It depends on the luminous flux (the amount of light) and on the angle of the beam of light. Example: Think of two types of 5 mm LED with different angles - e.g. 10 and 120 degrees - but with constant light intensity via the angle of reflected beam. Despite emitting the same amount of light (luminous flux, here 5 lumens), the 10-degree LED has a luminous intensity that is more than 130 times higher than that of the 120-degree LED, since the 120-degree LED disperses the amount of light (5 lumens) over a much wider angle. Consequently, the 10-degree LED is suitable for illuminating more distant areas, while the 120-degree diode lends itself to the illumination of close-up ranges. The luminous intensity of our new lamps is adjustable. Through the Advanced Focus System you can regulate the exit angle of the light as quick as a flash and create your own light architecture.