The most important Basic Terms of Light Technology
Luminous flux refers to the emitted quantity of light
Illuminance refers to the illuminated area.
Luminous intensity refers to the strength of the beam
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.
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 super-
markets 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.
Lichtstärke 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.