Easy to understand graphic explaining the difference between lux and lumens as well as a conversion calculator.
In a lamp, electrical energy is converted into radiant energy and emitted. Only a portion of that radiation is visible light; the rest is heat (infrared). The total amount of visible light that a lamp emits in all directions is expressed in lumens. Only visible light counts, so the measur...
the luminous flux is the same, which is 100 lumens, but the area over which the light spread has changed. Therefore, the illuminance at 2 meters is one fourth of the value at 1m, which is 25lux. Further away the illuminance is even lower. ...
Brightness refers to the intensity of led light reflected by the illuminated object and entered into the human eye, the unit is (cd/m2); and illuminance refers to how much light shines on the illuminated object, the unit is (lm/m2) Brightness is directly related to the reflectivity of the...
1000 lumens brighter light output ? 3700 lumensvs2700 lumens 4 dB quieter ? 33 dBvs37 dB 200" bigger maximum projection size ? 500"vs300" 0.1:1 bigger zoom ratio ? 1.3:1vs1.2:1 9W more audio output power ? 2 x 5Wvs1 x 1W
Contrast ratio is the visual distance between the lightest and the darkest colors that may be reproduced on the display. A high contrast ratio is desired, resulting in richer dark colors and more distinctive color gradation. has motorized focus ...