An ideal lux meter should have the following conditions
1. Compact Size, Light Weight
The opportunity to use the illuminance meter is very wide, and the timing of application is often in different places, so the first prerequisite for the portable illuminance meter is small size and light weight.
2. Accuracy
Whether the illuminance meter is good or not has an absolute relationship with its accuracy. Of course, it is also closely related to its price, so it is necessary to buy a lux meter with high accuracy at a reasonable price. Generally, the error should not exceed ±15%.
3. Color Compensation
The types of light sources are all-encompassing. Some focus on red high-pressure lamps with longer wavelengths, or blue-violet ones with shorter wavelengths such as Daylight fluorescent lamps; there are also more evenly distributed ones such as incandescent bulb series. The sensitivity of the same illuminance meter to different wavelengths may be slightly different. Therefore, appropriate compensation is necessary.
4. Cosine Compensation
We all know that 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 between 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.
