To be really sure whether the desired illuminance is achieved with the installed luminaires, it can be checked with a lux meter at the appropriate distance from the light source. The online calculator will help you to find a reference point for your lighting design. Now you know the correlation between lux and lumens in connection with distance and angle. In order to ensure homogeneous lighting with a corresponding lux value, a professional light planning should be involved. The positions of the individual lights are chosen in a way that the light cones overlap. ![]() For a weapon flashlight to be an effective self-defense tool, it must be at least a 120 lumens flashlight because anything less than that will not disorient an attacker. So the illuminance in the light circle is not homogeneous.įor the complete illumination of rooms or specific areas with a minimum illumination intensity, in most cases several LED luminaires are used. It takes 80 lumens to cause temporary flash blindness in the dark, and around 200 lumens can cause temporary blindness in the daytime. Especially in the peripheral areas, the luminous intensity usually decreases. When using a single light source, it should be noted that the light distribution of many LED spotlights does not always have to be uniform within the beam angle. ![]() After a click on the Calculate button you will see the size of the illuminated area and the lux value. ![]() Select Lumen to Lux in the calculator and enter 470 as the lumen value, 110 as the beam angle and 6.5 for the distance. You want to find out how much lux the table is illuminated with. Example: A spotlight with a beam angle of 110° and a light output of 470 lumens is mounted at a height of 6.5 ft above a table.
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