Four general requirements for light meters
● Compact Size, Light Weight
The use opportunities of illuminance meters are very wide, and the timing of use is often in different places. Therefore, the portable size, small size and light weight are the prerequisites for the illuminance meter.
● Accuracy﹝Accuracy﹞
Whether a light meter is good or bad has a direct relationship with its accuracy. Of course, it is also closely related to its price. Therefore, it is necessary to buy a high-accuracy illuminance meter at a reasonable price. Generally, it is appropriate to have an error of no more than ±15%.
● Color Compensation﹝Color Compensation﹞
The types of light sources are all-encompassing. Some focus on red high-pressure lamps with longer wavelengths, or blue-violet lamps with shorter wavelengths such as Daylight fluorescent lamps. There are also evenly distributed ones such as incandescent light bulbs. The same illuminance meter may have slightly different sensitivity to different wavelengths. are different, so appropriate compensation is necessary.
●Cosine Compensation﹝Cosine Compensation﹞
As we all know, the brightness of the illuminated surface is related to the incident angle of the light source. In the same way, when measuring with a light meter, the incident angle of the sensor (Sensor) and the light source will naturally affect the reading value of the light meter. Therefore, whether a good illuminance meter has the function of cosine compensation cannot be ignored.
