Today and with the consumption as data vital at the time of select a luminaire, already not us is worth only with compare them power (W) of the luminaries, need also compare the performance light by its power. There comes into play two parameters lumens (Lm) and the Lux (lux).
We will explain what is the difference and its equivalence:
- Lumen (Lm): It is the unit of the international system to measure the luminous flux. The measurement of the luminous power emitted at an angle determined by a source, i.e. the unit indicating the total “amount” of light that we perceive in a certain angle.
- Lux (Lux): It is the unit for the international system of units for the lighting level. It is the feeling of lightness. Their equivalence is of a lumen / m². Used in photometry as a measure, taking into account the different wavelengths depending on the function of luminosity, a standard model of the sensitivity to light of the human eye. In short, it is the amount of light we have in one square meter.
Lumen and Lux in the environment
That a focus LED of 100W is capable of issuing 1000 lumens, not means that of much feeling of light, will depend on of its angle of opening and the space to illuminate; for example, if 10 light only square meters will have 100 lux in total (very dark) but if we are in 1 square meter room we will have 1000 lux (very light).
Them bulbs LED emit its light in an angle given to difference of them bulbs incandescent that emit their light to 360 ° (losing its efficiency). LED best leverages its light for this reason, with lower consumption we can give 1000 lumens with only 11W (90% savings) and at an angle of 120 ° illuminated directly by where we move (not toward the ceiling) and therefore the feeling of these 1000 lumens light will be greater than the conventional lamp unlike modern design night lights.
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