Light meters or light detectors are also used in illumination. Their purpose is to measure the illumination level in the interior and to switch off or reduce the output level of luminaires. This can greatly reduce the energy burden of the building by significantly increasing the efficiency of its lighting system. It is therefore recommended to use light meters in lighting systems, especially in rooms where one cannot expect users to pay attention to manually switching off the lights. Examples include hallways, stairs, and big halls.

There are, however, significant obstacles to overcome in order to achieve a successful implementation of light meters in lighting systems, of which user acceptance is by far the most formidable. Unexpected or too frequent switching and too bright or too dark rooms are very annoying and disturbing for users of the rooms. Therefore, different type of lux meters are available in market as per need. So it is also very important to do calibration of Lux meters to get the right proportion of light.

Lux meter is a precision measuring instrument used in Lux value measurement under Quality Assurance and Testing. … Hence, Lux meters need to be calibrated and repaired (if necessary) periodically.