In the areas where too little or too much light can lead to damage, or where only a narrowly limited range of illuminance values leads to optimum results, stationary lux meters are used for continuous light measurement. The lighting of ordinary recreation rooms is usually checked with a mobile lux meter only when there is a specific reason to do so. In other areas, it is a matter of falling below maximum values, since light is not desirable for certain processes because it shortens the shelf life of certain substances or causes other undesirable reactions. This applies, for example, to lighting in hospital, sick and nursing rooms, but also to lighting for the cultivation of plants and for the rearing and keeping of animals in stables. It is not always a question of adhering to minimum values, but in some areas also of the targeted use of different illuminance levels.
In some cases, it is possible to determine directly on site whether sufficient lighting conditions can be achieved by replacing the lamps with lamps with a higher luminance efficiency or by installing additional luminaires. If the illuminance is not sufficient at all points, the mobile lux meter can also be used to quickly and easily test different options for improvement. Since such measurements often involve testing many individual measuring points or even complete grids, handy lux meters with battery operation are generally used for this purpose.įor the measurements of illuminance in the workplaces, traffic routes and in occupied areas, these lux meters must be adapted to the spectral brightness sensitivity of the human eye and also correctly evaluate obliquely incident light. In order to determine whether the desired target values are achieved on all the relevant surfaces with an existing or just installed lighting system, a mobile lux meter is usually used. For example, the measurements are taken on the table surface in the case of work tables or workbenches, on the panel surface in the case of wall panels, and in the case of traffic routes – on their surface. This applies to both private and public areas.Ĭompliance with the illuminance values specified in accident prevention regulations, occupational health and safety directives and technical standards is checked with the lux meter at the level relevant for the use. To ensure that dangerous situations can be perceived visually and that the completion of work and learning tasks is not made difficult by insufficient lighting, minimum illuminance levels are prescribed for many areas.
Certain lighting conditions are necessary to recognize details, colors and spatial structures. In the darkness, human vision is significantly limited. Measurements with a mobile or stationary lux meter Other features important for the measurement and additional functions that are necessary or desired should be evaluated. The required accuracy of the measurements should be determined in advance. The measuring range of the device must match whether measurements are to be taken indoors, outdoors or under special lighting conditions.
#INSTRUMENTS QUIZ RANGE SERIES#
For single measurements and time-limited series of measurements at different locations, mobile lux meters are suitable. For continuous measurement of lighting conditions at the same position, a stationary lux meter should be selected. The selection can be narrowed down using the following points: For this purpose, it is important to know under which conditions and with which aim the illuminances are to be measured. In order to find a suitable model from a large number of the lux meters available, the requirements for the device should first be clarified. When comparing different measuring points and evaluating the measurement results, it must be taken into account that the impression of brightness can differ even for the surfaces illuminated in the same way if they have different colors or structures. One lux is defined as one lumen per square meter, which corresponds to the illuminance produced by the light of a candle at a distance of one meter. The lux meter can be used to determine how much of the luminous flux emitted by one or more light sources reaches a specific surface. The illuminance is a value that does not refer to the light source, but to the illuminated area. A lux measuring device or lux meter is therefore a device for determining illuminance. Lux is the unit for illuminance in the international SI system of units.
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