Why do I need to use a light meter?
● Small size and light weight (Compact Size, Light Weight)
The opportunities for using an illuminance meter are very wide, and the timing of application is often in different places, so a portable body with small size and light weight is the first prerequisite for an illuminance meter.
● Accuracy
The quality of an illuminance meter is absolutely related to its accuracy. Of course, it is also closely related to its price, so it is necessary to buy an illuminance meter with high accuracy at a reasonable price, generally with an error of no more than ± 15%.
Color Compensation
There are various types of light sources, some of which focus on longer wavelength red high-pressure lamps, or shorter wavelength blue purple lamps such as Daylight fluorescent lamps; There are also relatively evenly distributed series such as incandescent bulbs, where the sensitivity of the same illuminance meter may vary slightly for different wavelengths, so moderate compensation is necessary.
● Cosine Compensation
As we all know, the brightness of the illuminated surface is related to the incident angle of the light source. By the same token, when using an illuminance meter for measurement, the angle of incidence between the sensor and the light source will naturally affect the reading of the illuminance meter. So whether a good illuminance meter has cosine compensation function cannot be ignored.
